| 单词 | listening key |
| 释义 | > as lemmaslistening key listening key n. Telephony (see quot. 1940). ΘΚΠ society > communication > telecommunication > telegraphy or telephony > telephony > telephone equipment > [noun] > exchange > exchange equipment private line1852 bank1884 call-disc1884 howler1886 trunk1889 multiple switchboard1891 rack1893 line switch1898 heat coil1900 relay rack1902 multiple1905 listening key1906 telharmonium1906 wiper1906 preselector1912 line finder1922 rank1924 routiner1928 keysender1929 uniselector1930 wiper arm1933 1906 J. Poole Pract. Telephone Handbk. (ed. 3) x. 159 (heading) Kellogg combined listening and ringing key. 1940 Chambers's Techn. Dict. 505/1 Listening key, the lever key which the operator throws, to put her head-set on to a cord circuit and speak to a subscriber. < as lemmas |
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