Application Type
National Patents
Application SubType
National Patent
(10) Registration Number and Date
1972/000219 1973.11.27
Status
Invalidated
(180) Expiration Date
1992.06.06
(20) Filing Number and Date
BW AP/P/1972/000219 1972.06.06
(40) Publication Number and Date
(85) National Entry Date
(30) Priority Details
(71/73) Applicant
(72) Inventor
(74) Representative Name
(EN) SPOOR AND FISHER : P O Box 454
(54) Title
(EN) TELEPHONE EXCHANGE WITH MEANS FOR ALLOWING THE ENCLOSING OF A PRIVILEGED CALLING SUBSCRIBER IN A CONNECTION ESTABLISHED BEFORE
(57) Abstract
(58) Citations