Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1975-05-05
1977-01-11
Burke, Wallace R.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D0699
Patent
active
D02430193
REFERENCES:
patent: D238607 (1976-01-01), Gannon
patent: 3428146 (1969-02-01), Bair
Burke Wallace R.
Confer Plastics Inc.
Gandy James M.
Sommer Kenneth R.
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