Shaft gate

Details Shaft gate Shaft gate

2007-01-30

2007-01-30

Clark, Doris (Department: 2914)

Building units and construction elements

Prefabricated unit

Closure

Design Patent

active

29234723

CLAIM:
The ornamental design for a shaft gate, as shown.

REFERENCES:
patent: 3756568 (1973-09-01), Mocny et al.
patent: D347284 (1994-05-01), Brigden
patent: D348736 (1994-07-01), Norris
patent: 6276668 (2001-08-01), Sweeley
patent: D492422 (2004-06-01), De Lorenzo

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