Seal for a roof vent pipe or similar article

Details Seal for a roof vent pipe or similar article Seal for a roof vent pipe or similar article

1981-01-27

1983-06-21

Spangler, Robert C.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2301

Patent

active

D02694549

REFERENCES:
patent: D216693 (1970-03-01), Dammer
patent: 1317574 (1919-09-01), Grosvold
patent: 1587250 (1926-06-01), Stephenson
patent: 3602530 (1971-08-01), Elwart
patent: 3731952 (1973-05-01), Elwart
patent: 3977137 (1976-08-01), Patry
patent: 4120129 (1978-10-01), Nagler et al.
patent: 4211423 (1980-07-01), Resech

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