Telephone loop tester

Details Telephone loop tester Telephone loop tester

1989-04-10

1991-07-23

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Electrical property

Patent

active

D03184315

REFERENCES:
patent: D234603 (1975-03-01), Snow et al.
patent: D242722 (1976-12-01), Bell
patent: D249658 (1978-09-01), Fields
patent: D254778 (1980-04-01), Kitada et al.
patent: D292493 (1987-10-01), King
patent: 2449057 (1948-09-01), Clayden
patent: 3792205 (1974-02-01), O'Dea
patent: 4022987 (1977-05-01), O'Dea
patent: 4292480 (1981-09-01), Sweatt
patent: 4513179 (1985-04-01), Phillips et al.
patent: 4536703 (1985-08-01), Jablway et al.
patent: 4591671 (1986-05-01), Pinede et al.

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