GB190907605A - Improvements in and relating to Sound Reproducing Apparatus. - Google Patents

Improvements in and relating to Sound Reproducing Apparatus.

Info

Publication number
GB190907605A
GB190907605A GB190907605DA GB190907605A GB 190907605 A GB190907605 A GB 190907605A GB 190907605D A GB190907605D A GB 190907605DA GB 190907605 A GB190907605 A GB 190907605A
Authority
GB
United Kingdom
Prior art keywords
spring
metal shell
carbon
battery
attached
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
English (en)
Inventor
Willis Otis Casimir Ellis
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB190907605A publication Critical patent/GB190907605A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/04—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
GB190907605D 1909-03-30 1909-03-30 Improvements in and relating to Sound Reproducing Apparatus. Expired GB190907605A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190907605T 1909-03-30

Publications (1)

Publication Number Publication Date
GB190907605A true GB190907605A (en) 1909-09-30

Family

ID=32443206

Family Applications (1)

Application Number Title Priority Date Filing Date
GB190907605D Expired GB190907605A (en) 1909-03-30 1909-03-30 Improvements in and relating to Sound Reproducing Apparatus.

Country Status (3)

Country Link
DE (1) DE223610C (https=)
FR (1) FR405273A (https=)
GB (1) GB190907605A (https=)

Also Published As

Publication number Publication date
FR405273A (fr) 1909-12-24
DE223610C (https=)

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