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German Wall Telephone by Tefag, c. 1925...
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The Kay Telephone Set No. 4, c. 1950...
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Intercom Telephone by L.M. Ericsson, c. 1925...
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2 Bell-Type Telephones, c. 1880...
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2 British Intercom Telephones, c. 1910...
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Miniature Telegraph and 2 Bell-Type Telephone...
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Small Morse Telegraph with Key, c. 1900...
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Hasler Morse Telegraph, c. 1885...
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Austrian Morse Telegraph, c. 1900...
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French Dial Telegraph Set by Bréguet, c. 1855...
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Bréguet-Type Toy Telegraph by Biloret et Mora...
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Austrian Telegraph by J. Leopolder, Vienna, c...
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Soviet Cipher Machine "Fialka M-125-3" 10-Whe...
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Addi-Cosmos Adder, 1921...
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Burkhardt Arithmometer, 1919...
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2 Adix Adding Machines...
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Heureka Adding Machine, 1907...
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Mercedes/Gauss Calculator, 1907 onwards...
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Twin-Cylinder Compound Steam Engine...
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Working Model of a Single-Cylinder Overcrank ...
