pdf 501-165-110 i3 May73 - Dialer, 53A - Automatic Preset Touch Tone Popular
By Paul F 656 downloads
501-165-110-i3-53A_Dial_tl.pdf
Issue 3, May 1973. Plus ADDENDUM issue 1, August 1974. For Tone Detector 1A350, see 501-166-100. For 43A Rotary Dialer, see 501-165-101.
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