Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1979-08-20
1983-02-01
Gandy, James M.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D0606
Patent
active
D02678179
REFERENCES:
patent: D223348 (1972-04-01), Boyle
patent: 1217713 (1917-02-01), Cotter
patent: 3356180 (1967-12-01), Parry
Gandy James M.
Rainer Norman B.
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