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Automatic Electric Laboratories Inc
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Automatic Electric Laboratories Inc
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Schaltungsanordnung fuer Fernsprechanlagen, insbesondere selbsttaetige Fernsprechanlagen, mit mechanisch voneinander unabhaengigen Waehlern, die Zugang zu Gruppen abgehender Leitungen haben
Schaltungsanordnung fuer selbsttaetige oder halbselbsttaetige Fernsprechanlagen, in denen die Sprechwaehler unter Zuhilfenahme von Steuerstromkreisen eingestellt werden