Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1978-02-21
1980-03-04
Gandy, James M.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D0699
Patent
active
D02543940
REFERENCES:
patent: 3907064 (1975-09-01), Svalberg et al.
Kiss Alexander S.
Leslie Frank B.
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