Line protector distribution board for telephone exchange systems

Details Line protector distribution board for telephone exchange systems Line protector distribution board for telephone exchange systems

1992-06-02

1993-08-24

Douglas, Alan P.

Miscellaneous

Miscellaneous

D13161

Patent

active

D03387674

REFERENCES:
patent: D309291 (1990-07-01), Wharton
patent: D314557 (1991-02-01), Fesmire et al.
patent: 3949276 (1976-04-01), Reuting
patent: 4420792 (1983-12-01), Hegner et al.
patent: 4698727 (1987-10-01), Hibbert et al.
patent: 4796150 (1989-01-01), Dickey et al.
patent: 5057964 (1991-10-01), Bender et al.
patent: 5150271 (1992-09-01), Unterweger et al.

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