FR1142971A - Device for selective calling of a certain number of people in a building or group of buildings - Google Patents

Device for selective calling of a certain number of people in a building or group of buildings

Info

Publication number
FR1142971A
FR1142971A FR1142971DA FR1142971A FR 1142971 A FR1142971 A FR 1142971A FR 1142971D A FR1142971D A FR 1142971DA FR 1142971 A FR1142971 A FR 1142971A
Authority
FR
France
Prior art keywords
buildings
building
people
group
certain number
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)
Inventor
Nicolaas Robert De Graaf
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.)
NEDERLANDSCHE INDUSTRIE RADIO ARTIKELEN NV
Original Assignee
NEDERLANDSCHE INDUSTRIE RADIO ARTIKELEN NV
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 NEDERLANDSCHE INDUSTRIE RADIO ARTIKELEN NV filed Critical NEDERLANDSCHE INDUSTRIE RADIO ARTIKELEN NV
Application granted granted Critical
Publication of FR1142971A publication Critical patent/FR1142971A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Magnetic Treatment Devices (AREA)
  • Percussion Or Vibration Massage (AREA)
FR1142971D 1954-05-26 1955-05-25 Device for selective calling of a certain number of people in a building or group of buildings Expired FR1142971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL772571X 1954-05-26

Publications (1)

Publication Number Publication Date
FR1142971A true FR1142971A (en) 1957-09-25

Family

ID=19829900

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1142971D Expired FR1142971A (en) 1954-05-26 1955-05-25 Device for selective calling of a certain number of people in a building or group of buildings

Country Status (5)

Country Link
US (1) US2870435A (en)
DE (1) DE1103818B (en)
FR (1) FR1142971A (en)
GB (1) GB772571A (en)
NL (2) NL97845C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1099914B (en) * 1958-03-24 1961-02-16 Gen Motors Corp Pocket receiver for paging
CH365640A (en) * 1958-08-20 1962-11-15 Nl Ind Radio Artikelen Nira Nv Paging system
US3115622A (en) * 1958-10-15 1963-12-24 Polard Electronics Corp Panoramic scanning counter
US2921141A (en) * 1958-10-28 1960-01-12 Harry C Miller Company Communication and paging system
US3113270A (en) * 1959-12-18 1963-12-03 Standard Res Consultants Inc Paging and alarm system
US3739329A (en) * 1971-05-24 1973-06-12 Recognition Devices Electronic system for locating
WO2016082881A1 (en) 2014-11-27 2016-06-02 Abb Technology Ltd Distribution of audible notifications in a control room

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US887357A (en) * 1907-04-05 1908-05-12 Conn Linn Wireless telephone.
US968224A (en) * 1909-09-08 1910-08-23 Austin M Wolf Differential-gear lock.
US1465932A (en) * 1915-09-11 1923-08-28 Western Electric Co Multiplex radiotelegraph system
AT118829B (en) * 1929-05-16 1930-08-25 Alois Merth Signal apparatus for radio receivers.
CH174480A (en) * 1934-03-10 1935-01-15 Schneeberger Werner Wireless telegraphy and telephony calling device.
DE719014C (en) * 1934-08-23 1942-03-26 Telefunken Gmbh Transceiver arrangement for wireless two-way communication with separate transmitter and receiver parts and a common antenna
US2138894A (en) * 1935-07-31 1938-12-06 Ware Paul Radio paging system
US2198901A (en) * 1938-03-17 1940-04-30 Lorain Telephone Company Signaling system
US2395132A (en) * 1940-05-30 1946-02-19 Automatic Elect Lab Electrical signaling system
US2357925A (en) * 1942-08-07 1944-09-12 Rca Corp Combined reed and relay device
DE872071C (en) * 1943-04-16 1953-03-30 Alfred Dipl-Ing Mattern Tone frequency remote dialing or ringing procedures
CH234446A (en) * 1943-07-09 1944-09-30 Landis & Gyr Ag Frequency relay.
US2494451A (en) * 1946-01-31 1950-01-10 Rca Corp Personal call system
CH273564A (en) * 1947-11-13 1951-02-15 Philips Nv Switching to a receiver in a transmission system with selective calling for each receiver participating in the system.

Also Published As

Publication number Publication date
DE1103818B (en) 1961-03-30
US2870435A (en) 1959-01-20
NL97845C (en)
NL187887B (en)
GB772571A (en) 1957-04-17

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