Telephone line polarity tester

Details Telephone line polarity tester Telephone line polarity tester

1985-03-28

1987-07-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Electrical property

D10103

Patent

active

D02910713

REFERENCES:
patent: D288416 (1987-02-01), Romano
patent: 4263550 (1987-04-01), Schweitzer
patent: 4533796 (1985-08-01), Engelmore
patent: 4533864 (1985-08-01), Austin
patent: 4564728 (1986-01-01), Romano
patent: 4600810 (1986-07-01), Feldman
patent: 4620070 (1986-10-01), Ruehl
patent: 4626633 (1986-12-01), Ruehl

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