ELECTRO-MECHANICAL TELEPHONE EXCHANGE. Bags instead of Barrels for Sugar. California Gold. Preparation of Wool. particles of grease have been removed from it. Pig. I.–TELEPHONE WITH KEYS ATTACHED. Fig. 3TELEPHONE CENTRAL OFFICE. Fir. 2THE SWITCHING MACHINE, scientific american, 1892-11-26
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ELECTRO-MECHANICAL TELEPHONE EXCHANGE, Bags, Barrels, Sugar, California Gold, Preparation, Wool, particles, grease, removed, Pig, I.–TELEPHONE, KEYS ATTACHED, Fig, 3TELEPHONE CENTRAL OFFICE, Fir, 2THE SWITCHING MACHINE, scientific american, 1892-11-26, science, scientific, sciences, mind, health, tech, sustainability, publication, lab, sciam, sa, scientist, research, american, experiment, education, discovery, technology, analysis, magazine, u.s., insights, developments, weekly, broadsheet, inventor, innovation, inventions, patented, industrial revolution, emerging, trends, monthly magazine, united states, engravings, curious works, paper, discover, Scientific Paper, Weekly Journal, Practical Information, Art, Science, Mechanics, Chemistry, Manufactures, research, education, scientist, innovation, 19th century, vintage, america, Rufus M. Porter, 1845, journal, academic, newspaper illustrations, retro style, old-fashioned, media illustrations, victorian style, news, newspaperheadline, 19th century style, illustration, journalism
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