Definitions for calling drop
This page provides all possible meanings and translations of the word calling drop
The Standard Electrical Dictionary
In a telephone exchange or telegraph office a drop shutter annunciator, which falls to call the attention of the operator, notifying him that the line connected to such drop is to be connected to some other circuit.
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"calling drop." Definitions.net. STANDS4 LLC, 2016. Web. 12 Feb. 2016. <http://www.definitions.net/definition/calling drop>.