pdf 1224 Tl Popular
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1224 Use Nos. 1156-A, 1156-AD, 1167-A, 1209, 1217-A, 1218-A and 1230 desk set boxes when anti-sidetone circuits are desired. Booster type circuites require Nos. 1156 and 1167 desk set boxes. Local battery instruments require No. 1180 desk set boxes.
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