FR578161A - Hearing detection device for long wavelengths - Google Patents

Hearing detection device for long wavelengths

Info

Publication number
FR578161A
FR578161A FR578161DA FR578161A FR 578161 A FR578161 A FR 578161A FR 578161D A FR578161D A FR 578161DA FR 578161 A FR578161 A FR 578161A
Authority
FR
France
Prior art keywords
detection device
long wavelengths
hearing detection
hearing
wavelengths
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)
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.)
INFRA ROUGE PROCEDES CHARBONNE
Original Assignee
INFRA ROUGE PROCEDES CHARBONNE
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 INFRA ROUGE PROCEDES CHARBONNE filed Critical INFRA ROUGE PROCEDES CHARBONNE
Application granted granted Critical
Publication of FR578161A publication Critical patent/FR578161A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/06Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising selenium or tellurium in uncombined form other than as impurities in semiconductor bodies of other materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
FR578161D 1923-03-07 1924-03-07 Hearing detection device for long wavelengths Expired FR578161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE578161X 1923-03-07

Publications (1)

Publication Number Publication Date
FR578161A true FR578161A (en) 1924-09-19

Family

ID=3873372

Family Applications (1)

Application Number Title Priority Date Filing Date
FR578161D Expired FR578161A (en) 1923-03-07 1924-03-07 Hearing detection device for long wavelengths

Country Status (1)

Country Link
FR (1) FR578161A (en)

Similar Documents

Publication Publication Date Title
FR591963A (en) Device for the introduction of rigid instruments into the stomach
FR578161A (en) Hearing detection device for long wavelengths
FR578105A (en) Visual detection device for long wavelengths
FR572258A (en) Locking device for reversible handlebar
FR566530A (en) Connection device for t receiving device. s. f.
FR29687E (en) Suspension device for aeronat bombs
FR582282A (en) Rigid drive device for bicycles
FR551183A (en) Cutting device usable for the establishment of money orders or receipts
FR588309A (en) Traffic recording device
FR570254A (en) Locking device for reversible handlebars
FR574597A (en) Filter device
FR569362A (en) Coupling device for shafts
FR578225A (en) Recorder device for note taking
FR591897A (en) Sliding device for curtains
FR568570A (en) Improved device for driving perforated bands
FR568602A (en) Registration device for taximeters
FR593016A (en) Eye screen device
FR562659A (en) Traction device for plows
FR623955A (en) Device for teaching arithmetic
FR598366A (en) Device for increasing the sensitivity of rockets
FR602198A (en) Device for combining partial images
FR569509A (en) Matchbox device
FR578187A (en) Blower device for metallurgy
FR28051E (en) Receiver device for television
FR600562A (en) Device for presenting moving images