Building units and construction elements – Prefabricated unit – Closure
Patent
1975-09-10
1977-05-24
Burke, Wallace R.
Building units and construction elements
Prefabricated unit
Closure
D2502
Patent
active
D02444593
REFERENCES:
patent: 115883 (1871-06-01), Mott
patent: D237722 (1975-11-01), Kratky
patent: 683694 (1901-10-01), Livingstone
patent: 917275 (1909-04-01), Fasold
patent: 1518309 (1924-12-01), Crawford et al.
Bullock B. J.
Burke Wallace R.
Drake Hugh H.
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