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Scientific American, Vol. 6, No. 7 (1862) (1862)

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An illustration from Scientific American, Vol. 6, No. 7 (1862), 1862, leaf 0
ars since there was invented an hung upon a pivot near its lower end is bent aside as gence in manufactories, colleges and other places. instrument called an annunciator, by which the long The patent for this invention was granted through it moves along the rod by its pin pressing against the row… … 1861, and further information in relation to it may the left hand end of the plate, 4. When the slide, d, the side of the desk in the office. In this all the be obtained by addressing the inventor, J. H. H. Ben- is réleased from its forward draft, it is drawn back by wires from the several rooms…

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