Electric switch mechanism

L William - US Patent 1,491,151, 1924 - Google Patents
The principal object of the invention is to provide a simple, economical and efficient electric
switch mechanism. A further object of the invention is to provide an efficient electric switch …
被引用次数：1 相关文章

[引用][C] Electric switch mechanism

L William - US Patent 1,491,151, 1924 - freepatentsonline.com