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Author Topic: cochran wrench  (Read 1058 times)

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Offline amertrac

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cochran wrench
« on: June 16, 2013, 04:35:54 AM »
Cochran speednut wrench  patent date may 2 1913  Chicago ill
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Offline mvwcnews

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Re: cochran wrench
« Reply #1 on: June 16, 2013, 11:25:47 PM »
1916 ( http://www.datamp.org/patents/advance.php?pn=D48996&id=30746&set=5 ). 
The patent & manufacturing history of these "speednut" self adjusting wrenches is very convoluted. 
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