Title:
Method for connecting presemiflanged rungs to preapertured spaced ladder rails
Document Type and Number:
United States Patent 3140540

Inventors:
Murry, Greenman
Publication Date:
07/14/1964
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Assignee:
Murry, Greenman
Primary Class:
29/512
Other Classes:
29/523
International Classes:
B21D39/06; E06C7/08; B21D39/00; E06C7/00
US Patent References:
1609597Method of connecting parts
1612083Method and machine for assembling spools
1645701Method of making spools
3039186Method of forming a joint between the rail and rung of a ladder


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