Multiple line self-contained telephone

Details Multiple line self-contained telephone Multiple line self-contained telephone

Category

H - Electricity

Subcategory

04

Subsubcategory

M

CPC

379/63, 379/67

IPC codes

H04M 7/00 (2006.01) H04M 1/82 (2006.01) H04M 3/22 (2006.01) H04M 19/00 (2006.01)

Type

Patent

Patent number

CA 1237210

Description

MULTIPLE LINE SELF-CONTAINED TELEPHONE ABSTRACT A novel detection circuit is provided for indi- cating whether a telephone line is in use or is avail- able or is on hold. The simplified circuit can be incorporated within a telephone instrument so that no external circuitry is required.

Application Number

483737

Affiliated with

Also associated with

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