HVAC filter replacement timer

Details HVAC filter replacement timer HVAC filter replacement timer

1999-10-08

2000-09-26

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

D10 53, 1003

Patent

active

D04311965

REFERENCES:
patent: D293557 (1988-01-01), Bartholoman et al.
patent: D300306 (1989-03-01), Arnoux et al.
patent: D320167 (1991-09-01), Imai
patent: D321489 (1991-11-01), Heimburger et al.
patent: D323463 (1992-01-01), Cham
patent: D370911 (1996-06-01), Mo
patent: D378357 (1997-03-01), Chan
patent: D385801 (1997-11-01), Chan

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