From International Dictionary of Marine Aids to Navigation
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5-4-260 (Key) Sender

In automatic telephony, a device which accepts and stores groups of coded pulses and which thereafter controls the setting up of a call. For a key sender, the pulses are produced by the depression of digit keys.

Reference: B.S. (modified)

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

Centre of buoyancy


International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM