Tooth brushing timer

Details Tooth brushing timer Tooth brushing timer

1997-05-05

1998-05-05

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

1003

Patent

active

D03940136

REFERENCES:
patent: D166745 (1952-05-01), Gaylord
patent: D232213 (1974-07-01), Dobyns
patent: D232224 (1974-07-01), Dobyns
patent: D278801 (1985-05-01), Long
patent: D284227 (1986-06-01), Dagowitz
patent: D330822 (1992-11-01), Steiner
patent: D380164 (1997-06-01), Galla
patent: 1973390 (1934-09-01), Plants
patent: 4991755 (1991-02-01), Grasmark

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