GB1324018A - Call tone devices - Google Patents

Call tone devices

Info

Publication number
GB1324018A
GB1324018A GB5417370A GB1324018DA GB1324018A GB 1324018 A GB1324018 A GB 1324018A GB 5417370 A GB5417370 A GB 5417370A GB 1324018D A GB1324018D A GB 1324018DA GB 1324018 A GB1324018 A GB 1324018A
Authority
GB
United Kingdom
Prior art keywords
capacitor
transistor
oscillator
astable
circuit
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
GB5417370A
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.)
Besson Partner Ltd A P
Original Assignee
Besson Partner Ltd A P
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 Besson Partner Ltd A P filed Critical Besson Partner Ltd A P
Publication of GB1324018A publication Critical patent/GB1324018A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems, e.g. audible personal calling systems
    • G08B3/10—Audible signalling systems, e.g. audible personal calling systems using electric transmission; using electromagnetic transmission

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Amplifiers (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB5417370A 1970-11-13 1970-11-13 Call tone devices Expired GB1324018A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5417370 1970-11-13

Publications (1)

Publication Number Publication Date
GB1324018A true GB1324018A (en) 1973-07-18

Family

ID=10470159

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5417370A Expired GB1324018A (en) 1970-11-13 1970-11-13 Call tone devices

Country Status (4)

Country Link
US (1) US3742491A (https=)
JP (1) JPS5112399B1 (https=)
DE (1) DE2061379A1 (https=)
GB (1) GB1324018A (https=)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995492A (en) * 1975-08-11 1976-12-07 Clynes Manfred E Sound-producing isometric exerciser
JPS61185411U (https=) * 1985-05-10 1986-11-19
US5633625A (en) * 1995-03-20 1997-05-27 Saturn Electronics & Engineering, Inc. Electronic chime module and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009099A (en) * 1957-05-09 1961-11-14 Schiffmann Gmbh Alois Testing instrument for electric alternating voltages
US3108597A (en) * 1958-09-12 1963-10-29 Relaxacizor Inc Generator for electronic muscle stimulator
CH1080564A4 (https=) * 1964-08-18 1966-05-14
US3341842A (en) * 1964-08-28 1967-09-12 Angelus S A Acoustical signal generator
US3346857A (en) * 1965-07-19 1967-10-10 Mangood Corp Plural tone audible indicating apparatus having variable time ratio of tones

Also Published As

Publication number Publication date
US3742491A (en) 1973-06-26
DE2061379A1 (de) 1972-05-18
JPS5112399B1 (https=) 1976-04-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]