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Scientific American, Vol. 36, No. 12 (1877) (1877)
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the message tube. is thus established between the vacuum main and the mes- The second carrier is then inscrted sage pipe. The carrier is pushed forward from the distant and the handle pulled forward as small clamp made for the purpose. The tube is then in its previously explained, again opening… … Fig. © 1877 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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