Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 805
FIG. 556.—RAISING POLE. … FTG. SST—KATSING POLE. 784 AMERICAN TELEPHONE PRACTICE. 17 feet in length into which a hardwood spar is inserted, so that atelescopic adjustment is afforded,thus giving a long boom suitable toraising different lengths of poles. By this means poles 70 feet inlength are easily handled. On the front…
Telephone
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