Telephone system eavesdropping device

Details Telephone system eavesdropping device Telephone system eavesdropping device

1953-02-02

1981-08-25

Birmiel, H. A.

179 81E, 179 15R, H04K 100

Patent

active

042861136

ABSTRACT:
1. In a telephone system including a telephone microphone at a subscriber's position, a telephone receiver and circuit connections there-between, contact terminals for said circuit connections and a disconnect switch associated with said contact terminals, subscriber circuit connections leading to the aforesaid connection, means located remote from said subscriber's position for impressing high-frequency energy on said subscriber circuit connections, signal translating means connected with said means effecting capacitative connection through said contacts and disconnect switch with said microphone whereby said microphone operates to modulate said means while said disconnect switch is disconnected from said contacts.

REFERENCES:
patent: 2206590 (1940-07-01), Webb
patent: 2461646 (1949-02-01), Lewis

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