FR706681A - Improvements to sound transmitters and receivers for use with telephones or the like - Google Patents

Improvements to sound transmitters and receivers for use with telephones or the like

Info

Publication number
FR706681A
FR706681A FR706681DA FR706681A FR 706681 A FR706681 A FR 706681A FR 706681D A FR706681D A FR 706681DA FR 706681 A FR706681 A FR 706681A
Authority
FR
France
Prior art keywords
telephones
receivers
sound transmitters
transmitters
sound
Prior art date
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
Application number
Other languages
French (fr)
Inventor
Douglas Stuart Spens Steuart
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR706681A publication Critical patent/FR706681A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/12—Grabs actuated by two or more ropes
    • B66C3/125—Devices for control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02—Driving gear
    • B66D1/08—Driving gear incorporating fluid motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0125—Motor operated winches
    • B66D2700/0133—Fluid actuated

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Mechanical Operated Clutches (AREA)
  • Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
FR706681D 1929-12-05 1930-11-28 Improvements to sound transmitters and receivers for use with telephones or the like Expired FR706681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE352874X 1929-12-05

Publications (1)

Publication Number Publication Date
FR706681A true FR706681A (en) 1931-06-27

Family

ID=6278208

Family Applications (2)

Application Number Title Priority Date Filing Date
FR706682D Expired FR706682A (en) 1929-12-05 1930-11-28 Winch for dredgers equipped with a single motor
FR706681D Expired FR706681A (en) 1929-12-05 1930-11-28 Improvements to sound transmitters and receivers for use with telephones or the like

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR706682D Expired FR706682A (en) 1929-12-05 1930-11-28 Winch for dredgers equipped with a single motor

Country Status (4)

Country Link
BE (1) BE375201A (en)
FR (2) FR706682A (en)
GB (1) GB352874A (en)
NL (1) NL32174C (en)

Also Published As

Publication number Publication date
BE375201A (en)
FR706682A (en) 1931-06-27
NL32174C (en)
GB352874A (en) 1931-07-16

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