Mine dial and page phone system

Details Mine dial and page phone system Mine dial and page phone system

1977-01-03

1978-09-12

Claffy, Kathleen H.

179 16EC, 179 1H, 179 27G, 179 81R, H04M 118

Patent

active

041139852

ABSTRACT:
This invention relates to a contemporary paging type telephone for use in coal mines, with an added dial feature to work in conjunction with a local telephone switchboard or central telephone office switchboard. It provides the features of a contemporary single channel paging telephone system with the additional advantages of:

REFERENCES:
patent: 2339438 (1944-01-01), Thompson
patent: 3553386 (1971-01-01), Golembeski
patent: 3576401 (1971-04-01), Saxon
patent: 3854012 (1974-12-01), Chambers, Jr.
patent: 4064366 (1977-12-01), Wheatley et al.

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