Side boom attachment for tractors
作者： Vander M Dobeus , John W Carlson
DOI:
关键词: Civil engineering 、 Engineering 、 Waste management 、 Boom
摘要:
lens.org 参考文章(5)
Harland W. Cardwell, Side boom and winch attachment for tractors ,(1937)
Harland W Cardwell, Counterweight for hoisting machinery ,(1941)
Nicholai M Erdahl, Side-mounted derrick for tractors ,(1932)
Maxwell A West, Automatic counterbalance for boom derricks ,(1944)
Roy H Zeilman, Removable counterweight for excavating and load handling machines ,(1941)