Before beginning the construction, the vertex figure ABCD is obtained by cutting each connected edge at ( in this case ) its midpoint.

Before railway construction on the Continent demanded huge quantities of maleable iron mainly for rails, for which low quality iron sufficed, Wallonia was the only Continental region to follow the British model successfully.

Before the days of blinking electrically lighted road barriers, highway construction zones were marked at night by kerosene fired, pot-bellied torches.

Before construction of the Panama Canal, a stagecoach line owned by Cornelius Vanderbilt's Accessory Transit Company connected the lake with the Pacific across the low hills of the narrow Isthmus of Rivas.

Before the construction of the North Portico, most public events were entered from the South Lawn, which was graded and planted by Thomas Jefferson.

Before major construction could begin Judah traveled back to New York City to raise funds to buy out The Big Four.

Before the advent of VLSI devices, TTL integrated circuits were a standard method of construction for the processors of mini-computer and mainframe processors ; such as the DEC VAX and Data General Eclipse, and for equipment such as machine tool numerical controls, printers and video display terminals.

Before the construction of several tunnels and modern roads that now connect it to Fujisawa, Ofuna and Zushi, on land it could be entered only through narrow artificial passes, among which the seven most important were called, a name sometimes translated as " Kamakura's Seven Mouths ".

Before 1976 the federal tax code favored new construction rather than the reuse of existing, sometimes historical, structures.

Before printed circuits ( and for a while after their invention ), point-to-point construction was used.

Before the construction of Waterloo International terminal in 1990, the vehicles were hoisted individually by the Armstrong lift outside the north wall of Waterloo main line station.

Before the construction of the current Teatro Colón, opera performances were given in several theatres, of which the first Teatro Colón and the Teatro Opera were the most important.

Before the construction of the Clarendon Building, the presses were in the basement of the Sheldonian Theatre, and the compositors could not work when the Theatre was in use for ceremonies.

Before the coming of the mine with construction starting in 1981 the Wopkaimin lived in a subsistence economy.

Before the war a number of 1930s council housing blocks were added to the stock, but it was after the war, partly as result of bomb site redevelopment, that the council housing boom really got into its stride, reaching its peak in the 1960s with the construction of several extensive estates, both by the Metropolitan Borough of Islington and the London County Council.

Before achieving success with his music, Gira worked many jobs in construction and demolition.

Before construction of the Unisphere, three piles were tested for structural integrity and all were found to be sound throughout their entire length.

Before the construction of I-90, the city was served by U. S. Route 10, which runs through downtown.

Before the construction of the Betuweroute Highspeed Railway, thorough soil research was performed in 1997.

Before construction of the projected aluminum-extrusion plant could begin, however, it became clear that the war would end soon and that the plant would not be needed.

Before completion of the construction, SAC activated the 351st Strategic Missile Wing at Whiteman on Feb. 1, 1963.

Before the construction of Fort Johnston, British settlements along the Carolina coast lacked fortifications to protect them against pirates and privateers, and numerous Spanish attackers exploited this weakness.

Before the post office was established in 1912, Reedsport was a camp for railroad construction workers.

Before its construction, according to local legend, court was held in a flea-infested abandoned stable.

Before they could guess his intention Rankin stepped forward and swung the guard's own gun against the uncovered head, hard.

Before memory, too, clouds over, let us make a note or two of what could be seen.

Before he could duck, another stone struck him.

Before he left the apartment he knocked on their door and asked if there was anything he could do for them.

Before the Juniors entered the ring the Steward announced that after all Juniors had moved their dogs around the ring and set them up, they could relax with their dogs.

Before Roberts could move inside to cut upward toward his face, he slammed his right fist into Roberts' belly.

Before he could snap it on, a stinging blow caught him in the ribs.

Before he could return to Burma, Field Marshal Slim had to rally the defeated remnants of a discouraged army and unite them with fresh recruits.

Before he could pass the river with safety, however, it was necessary to subdue certain fortresses, one of which was for several days vigorously defended by the governor, Yussuf el-Harezmi, a Khwarezmian.

Before the passage of the lex annalis, individuals could run for the Aedileship by the time they turned twenty-seven.

Before the demolition could take place, Admiral Sir Hugh Sinclair ( Director of Naval Intelligence and head of MI6 ) bought the site.

Before 1873, England had two parallel court systems: courts of " law " that could only award money damages and recognized only the legal owner of property, and courts of " equity " ( courts of chancery ) that could issue injunctive relief ( that is, a court order to a party to do something, give something to someone, or stop doing something ) and recognized trusts of property.

Before Stalin's consolidation of power, the Central Committee featured open debate, where even leading officials could be criticised.

Before a systematic excavation of the site could be undertaken, the village had to be relocated but the residents resisted.

Before the vote to award franchises in 1959, Murchison revealed to Marshall that he owned the song and Marshall could not play it during games.

Before many copies of the book could be printed, however, the printing press and most of the printed copies were destroyed by a mob in Missouri.

Before the advent of fast computing machines, solving a dynamical system required sophisticated mathematical techniques and could be accomplished only for a small class of dynamical systems.

Before the invention of the integrated circuit in 1959, electronic circuits were constructed from discrete components that could be manipulated by humans.

Before the question could be answered, the notion of " algorithm " had to be formally defined.

Before a new Grand Alliance could be concluded Leopold I prepared to send an expedition to seize the Spanish lands in Italy.

Before a lord could grant land ( a fief ) to someone, he had to make that person a vassal.

Before, geologists could only use fossils to date sections of rock relative to one another.

Before a new employee could rise to the level of mastery, he had to go through a schooling period during which he was first called an apprentice.

Before the assembled cardinals and delegations could engage in theological discussion, they had to decide how to sit during the proceedings.