The Fourth A&G EXPO was held at China-Zhengzhou International Convention & Exposition Center on September 14 - 16, 2017. there was 600 exhibitors and 40000 viewers to attend the exposition in the industry.A&G EXPO is a famous international grinding technology professional exhibition, whi...
Phenonic resin was first compounded by German chemist FengBayer(1835-1917)in 1872.In 1907 American chemist Leo Hendrik Bakeland (1863-1944)born in Belgium improved phenolic resin production technology,pat resin into practice andused it in induatry,In 1910 he established General Bak...
