Telegraphy – Systems – Simplex-reversing periodic
Patent
1986-08-01
1987-09-29
Schreyer, Stafford D.
Telegraphy
Systems
Simplex-reversing periodic
178 69B, 178 69E, 379417, 375 7, H04B 342
Patent
active
046970479
ABSTRACT:
A relay circuit comprise first and second relays having respective terminals at which positive cross-talk of a signal of positive polarity is produced when the other terminals to which the positive polarity signal is applied are in the make and break states, respectively, and third and fourth relays having respective terminals at which negative cross-talk of a signal of negative polarity is produced when the other terminals to which the negative polarity signal is applied are in the make and break states, respectively, wherein with regards to the terminals where the cross-talk occurs, the first and fourth relays are connected to each other and said second and third relays are connected to each other, respectively.
REFERENCES:
patent: 4293739 (1981-10-01), Iijima
Hirai Masato
Kurata Masami
Yoshino Ryozo
Hitachi , Ltd.
Hitachi Computer Engineering Co. Ltd.
Schreyer Stafford D.
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