2.- Also, luffing-jib cranes can improve material handling cycles in the jobsite, using them like auxiliry cranes to the pricinpal tower cranes, reducing the construction time. 3.- Normally, the maximun load bigger than a tower craneâs. 4.- In some places, local laws make luffing-jib cranes necessary. For instance,
Updated July 22, 2016. Observed on the first Monday in September, Labor Day is the day to âthrow down your tools,â and eat too many hotdogs while thanking American workers for their collective contribution to the strength, prosperity, quality of life, cold beer, and great sales enjoyed across the nation.
President Grover Cleveland and the U.S. Congress made Labor Day a national holiday in 1894. A fashion tradition is never to wear white after Labor day. White clothing is usually worn in the summer to keep cool and Labor Day marks the end of summer. New York has the highest union membership rate at 24.7 percent; South Carolina has the lowest rate at 2.1 percent.