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Figure 11-23.--Line and trunk packs control and function.
Figure 11-25 C and D.--Steps required to connect local calls through the SB-22/PT switchboard.
Seabee Combat Handbook, Volume 1
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Figure 11-24.--
Operating positions
of the push-to-talk switch.
Figure 11-25A and B.--Steps required to connect local calls through the SB-22/PT switchboard.
11-23
