CH278196A - Additional device for amplifying telephone calls. - Google Patents

Additional device for amplifying telephone calls.

Info

Publication number
CH278196A
CH278196A CH278196DA CH278196A CH 278196 A CH278196 A CH 278196A CH 278196D A CH278196D A CH 278196DA CH 278196 A CH278196 A CH 278196A
Authority
CH
Switzerland
Prior art keywords
telephone calls
additional device
amplifying telephone
amplifying
calls
Prior art date
Application number
Other languages
German (de)
Inventor
Bopp Gottfried
Original Assignee
Bopp Gottfried
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 by Bopp Gottfried filed Critical Bopp Gottfried
Publication of CH278196A publication Critical patent/CH278196A/en

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
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
CH278196D 1949-07-19 1949-07-19 Additional device for amplifying telephone calls. CH278196A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH278196T 1949-07-19
CH270703T 1949-07-19

Publications (1)

Publication Number Publication Date
CH278196A true CH278196A (en) 1951-09-30

Family

ID=25731233

Family Applications (2)

Application Number Title Priority Date Filing Date
CH270703D CH270703A (en) 1949-07-19 1948-10-02 Additional device for amplifying telephone calls.
CH278196D CH278196A (en) 1949-07-19 1949-07-19 Additional device for amplifying telephone calls.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CH270703D CH270703A (en) 1949-07-19 1948-10-02 Additional device for amplifying telephone calls.

Country Status (1)

Country Link
CH (2) CH270703A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112126B (en) * 1960-04-30 1961-08-03 Krone Kg Additional device for telephones

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112126B (en) * 1960-04-30 1961-08-03 Krone Kg Additional device for telephones

Also Published As

Publication number Publication date
CH270703A (en) 1950-09-15

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