Since the mid 1950s, when urethane foam first made its appearance in the American market, growth has been little short of fantastic.

Since the 1950s, this type of fiction has to a large extent merged with science fictional tropes involving cross-time travel between alternate histories or psychic awareness of the existence of " our " universe by the people in another ; or ordinary voyaging uptime ( into the past ) or downtime ( into the future ) that results in history splitting into two or more time-lines.

Since the 1950s, Prince Philip has also added herbaceous borders and a water garden.

Since the growth of global fishing enterprises after the 1950s, intensive fishing has spread from a few concentrated areas to encompass nearly all fisheries.

" Since the 1950s conservatism in the United States has been chiefly associated with the Republican Party.

* Since the 1950s, the United States Atomic Energy Commission has named its highest honor, the Fermi Award, after him.

Since the 1950s, hydrology has been approached with a more theoretical basis than in the past, facilitated by advances in the physical understanding of hydrological processes and by the advent of computers and especially geographic information systems ( GIS ).

Since the 1950s, when Lacan and Foucault argued that each epoch has its own knowledge system, which individuals are inexorably entangled with, many post-structuralists have used historicism to describe the view that all questions must be settled within the cultural and social context in which they are raised.

Since the 1950s, many blues harmonica players have amplified their instrument with microphones and tube amplifiers.

Since the 1950s and 1960s in particular, the Irish have become assimilated into the British population.

Since the 1950s, following the lead of D. W. Jefferson, there are those who argue that, whatever its legacy of influence may be, Tristram Shandy in its original context actually represents a resurgence of a much older, Renaissance tradition of " Learned Wit " – owing a debt to such influences as the Scriblerian approach.

Since the 1950s, manga has steadily become a major part of the Japanese publishing industry, representing a ¥ 406 billion market in Japan in 2007 ( approximately $ 3. 6 billion ) and ¥ 420 billion ($ 5. 5 billion ) in 2009.

Since the 1950s however, manufacturing shortcuts have resulted in a quality decline of machetes.

Since trade was restricted in the 1950s they have found work as high altitude porters, guides, cooks and other accessories to tourism and alpinism.

Since the early 1970s, oral history in Britain has grown from being a method in folklore studies ( see for example the work of the School of Scottish Studies in the 1950s ) to becoming a key component in community histories.

Since the 1950s, the club's helmets have featured eagle wings, originally silver on a kelly green helmet.

Since the late 1950s, almost all phono input stages have used the RIAA equalization standard.

Since the 1950s, television has been the main medium for molding public opinion.

Since the 1950s, television has been the main medium for molding public opinion.

Since the 1950s, Montevideo's prosperous middle classes have tended to abandon the formerly fashionable downtown areas for the more modern high-rise apartment buildings of Pocitos, a beachfront neighborhood east of the center.

Since the late 1950s, aerospace engineers have used the term " unobtainium " when referring to unusual or costly materials, or when theoretically considering a material perfect for their needs in all respects, except that it does not exist.

Since the end of the 20th century, the economic strength during the 1920s has drawn close comparison with the 1950s and 1990s, especially in the United States of America.

Since the 1950s, Real Madrid and Barcelona have dominated the championship.

Since then, the Cockney accent has been more accepted as an alternative form of the English Language rather than an ' inferior ' one ; in the 1950s the only accent to be heard on the BBC ( except in entertainment programmes such as Sooty ) was RP, whereas nowadays many different accents, including Cockney or ones heavily influenced by it, can be heard on the BBC.

Since these duties fit neatly with those of the proposed presidential aide, one person, with adequate staff assistance, could fill both jobs.

Since practical washing procedures are both lengthy and expensive, a number of laboratory tests have been developed for the numerical evaluation of detergents.

Since D and D' are both diagonalizable and they commute, they are simultaneously diagonalizable, and Af is diagonalizable.

Since N and N' are both nilpotent and they commute, the operator Af is nilpotent ; ;

Since Fogg's was a one-man, one-plane flying service, this meant that he would have to do both trips, flying alone 600 miles a day, under sub-freezing temperature conditions.

Since the adoption of a new constitution, early in 2010, the politics of Angola takes place in a framework of a presidential republic, whereby the President of Angola is both head of state and head of government, and of a multi-party system.

Since its independence, Armenia has maintained a policy of complementarism by trying to have friendly relations both with Iran, Russia, and the West, including the United States and Europe.

Since the Second World War, both theoretical and experimental fields have advanced at a rapid pace.

Since this picture was first developed by Ernst Stueckelberg, and acquired its modern form in Feynman's work, it is called the Feynman-Stueckelberg interpretation of antiparticles to honor both scientists.

Since 1972, the Roman Catholic Church uses the name " Anointing of the Sick " both in the English translations issued by the Holy See of its official documents in Latin and in the English official documents of Episcopal conferences.

Since the launch of Breakfast in 2000, the programme has been simulcast on both BBC One and BBC News, replacing the individual breakfast news programmes that had been run by both channels.

Since early 1989 the government recognizes both Israel and the Palestinian state.

Since most Western economies are now considered " open " with free capital movement, this essentially means that central banks may target interest rates or exchange rates with credibility, but not both at once.

Since then Calvin and Hobbes creator Bill Watterson has written extensively on the issue, arguing that size reduction and dropped panels reduce both the potential and freedom of a cartoonist.

Since current can be the flow of either positive or negative charges, or both, a convention for the direction of current which is independent of the type of charge carriers is needed.

Since tangents and inverse tangents are both continuous, our identification function is a homeomorphism between the real line and the unit circle without ∞.

Since both the noun and enclitic were declined, this led to " double declension ".

Since 2002, molecular phylogenetic studies have recognized a close relationship between Hydrochoerus and Kerodon supporting placement of both genera in a subfamily of Caviidae.

Since 2001, both baronies have been redesignated the City of Dublin.

Since two houses may be very different from one another, a design pattern for houses must be broad enough to apply to both of them, but not so vague that it doesn't help the designer make decisions.

Since 2004, the colón stopped circulating and is now never used in the country for any type of transaction ; however some stores still have prices in both colons and U. S. dollars.

In the first step, the final nonzero remainder r < sub > N − 1 </ sub > is shown to divide both a and b. Since it is a common divisor, it must be less than or equal to the greatest common divisor g. In the second step, it is shown that any common divisor of a and b, including g, must divide r < sub > N − 1 </ sub >; therefore, g must be less than or equal to r < sub > N − 1 </ sub >.

Since both birds are stringy, and taste unpleasant, the skin and feathers could be kept and filled with the cooked, minced and seasoned flesh of tastier birds, like goose or chicken.

Since 2002, the new Afghan government has engaged in cordial relations with both Iran and the United States, even as relations between Iran and the United States have grown strained due to American objections to Iran's nuclear program.