Title:
Method of making ladders
United States Patent 3327385
US Patent References:
/1684932.html
- - 1684932
Ladder
- - 3004625
Method of forming a joint between the rail and rung of a ladder
- - 3039186
Apparatus for connecting presemiflanged rungs to preapertured spaced ladder rails
- - 3119435
/1684932.html
- - 1684932
Ladder
- - 3004625
Method of forming a joint between the rail and rung of a ladder
- - 3039186
Apparatus for connecting presemiflanged rungs to preapertured spaced ladder rails
- - 3119435
Inventors:
Shaver, Raymond H.
Publication Date:
06/27/1967
View Patent Images:
Export Citation:
Assignee:
HARSCO CORP
Primary Class:
Other Classes:
182/228.600, 29/523
International Classes:
B21D39/06; E06C7/08; B21D39/00; E06C7/00
Foreign References:
| GB587952A | ||||
| GB667843A |