National Telegraphic Union · New York : N.T.U. · leaf 374
RK, and our great variety of Telegraph Material in stock, fullyestablish our claim that our stores are theDEPOTS OF TELEGRAPH SUPPLIES IN THIS COUNTRY. MODERN PRACTICE OF THE ELECTRIC TELEGRAPH. By FRANK L. POPE.PRICE $1 60. We will furnish the above work, together with Prof. J. ESmiths Manual op… … This Insulator shows a resistance of 100,000,000,000 B. A. Units,excelling ordinary Insulators in humid weather fully onehundred thousand fold. Its great strength and durability make it the most economiealInsulator in use. Every report received from them is of the most favorablecharacter.…
Telegraph
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