US221135A - Improvement in acoustic telephones - Google Patents

Improvement in acoustic telephones Download PDF

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Publication number
US221135A
US221135A US221135DA US221135A US 221135 A US221135 A US 221135A US 221135D A US221135D A US 221135DA US 221135 A US221135 A US 221135A
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US
United States
Prior art keywords
improvement
telephones
acoustic
acoustic telephones
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Publication date
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Publication of US221135A publication Critical patent/US221135A/en
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Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
    • A63H33/00—Other toys
    • A63H33/30—Imitations of miscellaneous apparatus not otherwise provided for, e.g. telephones, weighing-machines, cash-registers
    • A63H33/3016—Telephones

Landscapes

  • Circuit For Audible Band Transducer (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Description

US221135D Improvement in acoustic telephones Expired - Lifetime US221135A (en)

Publications (1)

Publication Number Publication Date
US221135A true US221135A (en) 1879-10-28

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ID=2290532

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US221135D Expired - Lifetime US221135A (en) Improvement in acoustic telephones

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US (1) US221135A (en)

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