GB274872A - Improvements relating to amplifying and recording telephonically transmitted sounds - Google Patents

Improvements relating to amplifying and recording telephonically transmitted sounds

Info

Publication number
GB274872A
GB274872A GB19171/27A GB1917127A GB274872A GB 274872 A GB274872 A GB 274872A GB 19171/27 A GB19171/27 A GB 19171/27A GB 1917127 A GB1917127 A GB 1917127A GB 274872 A GB274872 A GB 274872A
Authority
GB
United Kingdom
Prior art keywords
amplifiers
transformer
recorder
recording
casing
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
GB19171/27A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dictaphone Corp
Original Assignee
Dictaphone Corp
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 Dictaphone Corp filed Critical Dictaphone Corp
Publication of GB274872A publication Critical patent/GB274872A/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
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephone Set Structure (AREA)
GB19171/27A 1926-07-22 1927-07-19 Improvements relating to amplifying and recording telephonically transmitted sounds Expired GB274872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US124232A US1823717A (en) 1926-07-22 1926-07-22 Telephone recording system

Publications (1)

Publication Number Publication Date
GB274872A true GB274872A (en) 1928-06-21

Family

ID=22413599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19171/27A Expired GB274872A (en) 1926-07-22 1927-07-19 Improvements relating to amplifying and recording telephonically transmitted sounds

Country Status (4)

Country Link
US (1) US1823717A (OSRAM)
BE (1) BE343779A (OSRAM)
FR (1) FR637861A (OSRAM)
GB (1) GB274872A (OSRAM)

Also Published As

Publication number Publication date
US1823717A (en) 1931-09-15
BE343779A (OSRAM)
FR637861A (fr) 1928-05-10

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