Telephone usage timer

Details Telephone usage timer Telephone usage timer

1998-06-04

2000-05-23

Holtje, Nelson C

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

1003

Patent

active

D04254333

REFERENCES:
patent: D288416 (1987-02-01), Romano
patent: 3882670 (1975-05-01), Woolley
patent: 4079201 (1978-03-01), Scott et al.
patent: 4260855 (1981-04-01), Rubinstein
patent: 4473718 (1984-09-01), Ettel
patent: 5373488 (1994-12-01), Lidor
patent: 5815554 (1998-09-01), Burgess et al.

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