Title:
Method of making ladders
Document Type and Number:
United States Patent 3327385

Inventors:
Shaver, Raymond H.
Publication Date:
06/27/1967
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Assignee:
HARSCO CORP
Primary Class:
29/512
International Classes:
B21D39/06; E06C7/08; B21D39/00; E06C7/00
US Patent References:
1684932
3004625Ladder
3039186Method of forming a joint between the rail and rung of a ladder
3119435Apparatus for connecting presemiflanged rungs to preapertured spaced ladder rails
Foreign References:
GB587952A
GB667843A




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