Since the 1960s, composite airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control.

Since 1990, Bulgaria has an unstable party system, in the past two decades differently dominated by the post-communist Bulgarian Socialist Party or by the right Union of Democratic Forces and recently by the new right-oriented party-Citizens for European Development of Bulgaria.

Since they are based on several independent sets of measurements taken decades apart by different observers with different instruments, systematic errors may have influenced them.

Since uplift and erosion are more or less in equilibrium in the Himalaya, rapid uplift is balanced by annual increments of cubic kilometers of sediments washing down from the mountains, then on the plains settling out of suspension on vast alluvial fans or inland deltas over which rivers meander and change course at least every few decades, causing some experts to question whether manmade embankments can contain the problem of flooding.

Since few skateparks were available to skaters at this time, street skating pushed skaters to seek out shopping centers and public and private property as their " spot " to skate ( public opposition, in which businesses, governments, and property owners have banned skateboarding on properties under their jurisdiction or ownership, would progressively intensify over the following decades ).

Since the production of high-quality semiconductor materials was still decades away, Lilienfeld's solid-state amplifier ideas would not have found practical use in the 1920s and 1930s, even if such a device were built.

Since " Swing the Mood " was still on the sales charts going into 1990, it meant that Haley's " Rock Around the Clock ", in one way or another, appeared on UK or US sales charts in five consecutive decades.

Since 1959, total sales of three editions in four decades has exceeded ten million copies.

Since the 1960s, composite airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control.

Since 1979, Passive Solar Building Design has been a critical element of achieving zero energy by educational institution experiments, and governments around the world, including the U. S. Department of Energy, and the energy research scientists that they have supported for decades.

Since the turn of the 21st century, shipping has increased in the last few decades with fruit exports, increasing opening of the Chilean economy to world commerce, and larger-scale, Post-Panamax ships that do not fit the Panama Canal.

Since then, he has toured for the first time in decades with a new band and released acclaimed albums, including a reworked version of SMiLE in 2004, for which Wilson won a Grammy Award for " Mrs. O ' Leary's Cow ( Fire )" as Best Rock Instrumental.

Since oak barrels stop contributing to flavor after four or five decades, cognac is then transferred to large glass carboys called bonbonnes, then stored for future blending.

Since 1995 members of the African American History Alliance of Louisiana have gathered annually at Norco in January to commemorate the events of the German Coast Uprising, when men of color reached for freedom decades before the Civil War and Emancipation.

Since the supply roll is plastic, the lifespan of a used roll can be years or decades long, permitting image recovery long after disposal.

Since then, the group has gone through different lineup changes becoming one of the few acts to have successfully charted a single or an album in five decades.

Since the antenna is only required for a few days at Starwisp's launch and again for another few days several decades later to power it while it passes its target, Starwisp probes might be mass-produced and launched by the maser every few days.

Since prior to the 1830s the United States did not have a sculpture tradition of its own, save in the areas of tombstones, weathervanes and ship figureheads, the European neoclassical manner was adopted there, and it was to hold sway for decades and is exemplified in the sculptures of William Henry Rinehart ( 1825 – 1874 ), Hiram Powers, and Randolph Rogers.

Since about World War II, when soldiers often served in tropical locations, adult men have worn shorts more often, especially in summer weather, but the perception of shorts as being only for young boys took several decades to change and to some extent still exists in certain circles.

Since the U. S. Civil War, the powers of the federal government have generally expanded greatly, although there have been periods since that time of legislative branch dominance ( e. g., the decades immediately following the Civil War ) or when states ' rights proponents have succeeded in limiting federal power through legislative action, executive prerogative or by constitutional interpretation by the courts.

Since no real census has been taken for decades, the election results are the only indicator of the province's ethnic distribution, although it should be noted that many Assyrians and Yazidis claim that ballot papers were denied them, and in addition, many members of ethnic groups voted for mainstream parties, or ethnic parties that were attached to mainstream Arab or Kurdish led parties.

Since that time it has become more difficult for drugs to be imported into the United States than it had been in previous decades, but that does not stop the heroin smugglers from getting their product onto U. S. soil.

Since taking over the reins, Guild Companion Publications Ltd ( GCP ) has been involved in a comprehensive rebranding and recovery process of products from three decades of ICE publication, including some that have never before been available commercially as pdfs.

Since this only happened during the first few decades of stamp usage, and only for the few letters that were sent great distances, very few covers have survived.

Since Herbert was responsible for licensing and also censoring plays, he had a powerful influence on English drama for two decades, 1623-42.

Since then, and since the pure grain had gotten him divorced from every decent -- and even indecent -- group from Greenwich Village to the Embarcadero, he had become a sucker-rolling freight-jumper.

Since appeals to morality, to humanity, and to sanity have had such small effect, perhaps our last recourse is the deterrent example.

Since his seizure, Scotty had had little appetite ; ;

Since Mr. McKinley had to give a lecture, Rachel and Scotty drove home alone in the Plymouth.

Since she could not act, one part suited her as well as any other, and so she was the first person to offer Mr. Lincoln a glass of water, holding it up to the box, high above her head, to Miss Harris, who had asked for it.

Since the Santo Spirito hospital had taken only men, he had had no experience in the study of female anatomy ; ;

Since then, the flowers she had planted had spread all over the hill.

Since he had gross income of $600 or more, he must file a return in which he may claim an exemption deduction of $600.

Since the writer had established this democratic procedure in the beginning he had to go along with their decision -- after, of course, pointing out whether he thought their decision was a wise or an unwise one.

Since the writer had not noticed this characteristic in married students scattered throughout the various sections previous to this experiment, nor, as a matter of fact, in those who were continuing in `` single sections '', he can only conclude that there must have been something `` contagious '' within the specific group which caused this to occur.

Since the details of the elections were settled the change of government had no direct effect on the technical aspects of the elections, and may have been more important as an indication of royal displeasure with the U.N.F.P.

Since the strength of the Mexicans had been underrated, too small a posse had been collected, and since the deputy had not been provided with search warrants, MacPherson and his men decided it was much wiser to withdraw.

Since the magnitude of the plan made secrecy impossible, once the wheels had began to turn, persons controlling German industries, social institutions, and armed forces became, through their anti-Semitism or their tolerance of it, conscious accomplices of Hitler's crimes ; ;

Since Mrs. Calhoun remembered only that the marriage had been in the spring, he started to plod through several months.

Since then he had worked at this and that, though some said his main interest was gambling.

Since Election Day, Vice President Richard Nixon had virtually retired -- by his own wish -- from public view.

Since he possessed more power in an interdependent universe of living beings and dead spirits, the emperor had to use it for the benefit of the living.