Title:
Equipment for operator served calls at an intermediate switching center
United States Patent 3341662
Inventors:
Cerny, Louis J.
Orfeo, Cesareo
Curtis, Robert B.
Nightingale, John G.
Parkinson Jr., Frederick H.
Publication Date:
09/12/1967
Export Citation:
Click for automatic bibliography generation
Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
379/121.01
Other Classes:
379/123, 379/201.01, 379/224
International Classes:
H04Q3/00; H04Q3/00
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US Patent References:
3218392Signalling system for use with toll ticketing equipment
3133153Special service toll telephone system
3019294Paystation customer dialling in a toll ticketing telephone system
2357756Process of preparing a vitamin b complex concentrate