Barrier

Details Barrier Barrier

1997-07-03

1998-08-25

Clark, Doris

Building units and construction elements

Prefabricated unit

Closure

2502

Patent

active

D03974480

REFERENCES:
patent: D239543 (1976-04-01), Kratky
patent: 2756469 (1956-07-01), Cattermole et al.
patent: 2896277 (1959-07-01), Halligan
patent: 4162590 (1979-07-01), Earley
patent: 4677791 (1987-07-01), Larson et al.
patent: 5117585 (1992-06-01), Andrisin, III

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