Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 688
666 CENTRAL OFFICE EQUIPMENTS. 667 Such construction is well shown m Figs. 478 to 481, inclusive,these being views of the terminal room in one of the large offices ofthe Keystone Telephone Company, of Philadelphia, Pa. This workis that of the Kellogg Switch-Board and Supply Company. Fig. 478 shows…
Telephone
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