Portable step attachment for ladders
United States Patent 3115214
US Patent References:
/0886737.html
- - 0886737

/0897929.html
- - 0897929

/1013751.html
- - 1013751

Portable scaffold
- - 1474462

Step attachment for ladders
- - 1820315


Inventors:
Roberts, Ralph R.
Publication Date:
12/24/1963
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Assignee:
Roberts, Ralph R.
Primary Class:
182/228.300
Other Classes:
D25/69, 182/120
International Classes:
E06C7/16; E06C7/00
US Patent References:
2335046Portable and adjustable knockdown scaffold
2381569Rodent guard
2430642Safety trestle
3020972Combination utility cart and extension ladder
Foreign References:
BE516360A
GB757497A