The
PMBX No. 1 is a lamp
calling manual switchboard with lamp supervisories. The switchboards are
bolted together to form a suite. The
PMBX No. 1 is a lamp
calling manual switchboard with lamp supervisories. The switchboards are
bolted together to form a suite.
Introduced in 1940.
See the Ericsson section for a
description.
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Last revised 28 December, 2007
FM