Protection device for a subscriber{3 s telephone set
申请公布号:US4079211(A)
申请号:US19760697567
申请日期:1976.06.18
申请公布日期:1978.03.14
发明人:JANSSEN, DANIEL JOHANNES GERARDUS
分类号:H02H7/20;H04M1/00;H04M1/74;(IPC1-7):H04M1/00
主分类号:H02H7/20
摘要:A protection circuit for a subscriber's telephone set which comprises a resistor applied in series with the subscriber's line to which resistor a threshold device is connected in parallel, a network being provided which comprises the control input and which is connected between the subscribers' lines while the output of the threshold device is connected to the control input to switch the normally high impedance to a low impedance when the threshold voltage of the threshold device is exceeded by the voltage across the resistor.
OBTURATEUR A COMMANDE MAGNETIQUE POUR COMPRESSEUR DE FLUIDE NOCIF
Prefabricated structural element used as a form.
Improvements relating to material containers.
Process for the preparation of di-N-oxides and their pharmaceutical use.
Method for producing a moulding with a plastic cover from a wake-containing fibrous material.
GECOMBINEERD VACCIN VOOR IMMUNISERING TEGEN INFECTIES DOOR HAEMOPHILUS INFLUENZA, TYPE B.
Light emitting and receiving diode, in particular for optical telecommunication.
Method and plant for generating electrical energy.
STATION SERVICE DEVICE WITH MULTIPLE CHARGE TABLE
REAGENTTFILLED REACTION TUBE FOR AUTOMATIC CHEMICAL ANALYZER