Drain cover

Details Drain cover Drain cover

1978-09-13

1980-09-16

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2301

Patent

active

D02569485

REFERENCES:
patent: 782860 (1905-02-01), Lever
patent: 928032 (1909-07-01), Dawes et al.
patent: 1595516 (1926-08-01), Happ
patent: 1660010 (1928-02-01), Lemm
patent: 1741242 (1929-12-01), Lemm
patent: 1940742 (1933-12-01), Bryant
patent: 1950817 (1934-03-01), Rossman
patent: 3212416 (1965-10-01), Boersma
patent: 3674149 (1972-07-01), Donalson

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