| Patent Number |
Title Of Patent |
Date Issued |
| D242930 |
Membrane switch assembly font |
January 4, 1977 |
|
| D242723 |
Pushbutton telephone shield plate |
December 14, 1976 |
|
| 4081615 |
Subset switching means in apparatus for a key telephone system for enabling intercom substations |
March 28, 1978 |
| In an attachment apparatus for a key telephone system of the type which permits a plurality of intercom substations to access a trunk telephone line via a common communication circuit, a novel subset operable switching circuit is disclosed that permits each subset access to said common |
| 4064371 |
Apparatus for a key telephone system for enabling intercom substations to access trunk lines |
December 20, 1977 |
| An attachment to key telephone system apparatus is disclosed which permits an intercom substation to access a trunk telephone line. This includes an intercom-to-trunk line access unit for coupling telephonic communications between its input and a selected one of a plurality of trunk line |
| 4016372 |
Apparatus for a key telephone system for enabling intercom substations to access trunk lines |
April 5, 1977 |
| An attachment to key telephone system apparatus is disclosed which permits an intercom substation to access a trunk telephone line. This includes an intercom-to-trunk line access unit for coupling telephonic communications between its input and a selected one of a plurality of trunk line |
| 4012602 |
Toll restrictor for touch type digit selector |
March 15, 1977 |
| Means and methods are disclosed to prevent dialing of long distance telephone calls from a restricted local substation by counting the number of digits dialed at that station and preventing the sending of further digits once the count attains a predetermined number. Means are also in |
| 4000380 |
Toll restrictor for touch type digit selector |
December 28, 1976 |
| Improved means are disclosed to prevent a restricted local telephone substation or set from dialing long distance telephone calls by counting the number of digits dialed at the station and preventing the sending of additional digits once the count attains a predetermined number. An e |
| 3982079 |
Touch-to-rotary converter for a telephone instrument |
September 21, 1976 |
| A touch type dial digit selector to rotary type dial digit sender converts touch type dial input information to a rotary type dial output and includes a touch type selector pad having the ten digit selecting push buttons arranged in four rows and three columns and associated row and |
| 3931481 |
Plural line selector apparatus for enabling selection of one of a plurality of telephone lines |
January 6, 1976 |
| An electronic selector switch is disclosed that enables selection of one of a plurality of output circuits. The selector contains a plurality of bistable electronic switch means, each of which includes a first "set" input and a second "reset" input; a corresponding plurality of momentary |
