DE274903C - - Google Patents

Info

Publication number
DE274903C
DE274903C DENDAT274903D DE274903DA DE274903C DE 274903 C DE274903 C DE 274903C DE NDAT274903 D DENDAT274903 D DE NDAT274903D DE 274903D A DE274903D A DE 274903DA DE 274903 C DE274903 C DE 274903C
Authority
DE
Germany
Prior art keywords
contact
test
holding relay
alarm bells
safety
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.)
Active
Application number
DENDAT274903D
Other languages
German (de)
English (en)
Publication of DE274903C publication Critical patent/DE274903C/de
Active legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
    • G08B29/08—Signalling of tampering with the line circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Burglar Alarm Systems (AREA)
DENDAT274903D Active DE274903C (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
DE274903C true DE274903C (enrdf_load_stackoverflow)

Family

ID=531234

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT274903D Active DE274903C (enrdf_load_stackoverflow)

Country Status (1)

Country Link
DE (1) DE274903C (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
DE274903C (enrdf_load_stackoverflow)
EP1005710B1 (de) Fehlerstromschutzschalter
DE74343C (de) Elektrische Controlvorrichtung und Sicherung für Thürverschlüsse
DE409721C (de) Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb und Anschlussleitungenverschiedener Wertigkeit
EP0827251A2 (de) Elektrisches Niederspannungsschaltgerät
DE256552C (enrdf_load_stackoverflow)
DE294321C (enrdf_load_stackoverflow)
DE256075C (enrdf_load_stackoverflow)
DE285093C (enrdf_load_stackoverflow)
DE163548C (enrdf_load_stackoverflow)
DE201747C (enrdf_load_stackoverflow)
DE261729C (enrdf_load_stackoverflow)
DE219913C (enrdf_load_stackoverflow)
DE148921C (enrdf_load_stackoverflow)
DE136244C (enrdf_load_stackoverflow)
DE235261C (enrdf_load_stackoverflow)
DE192631C (enrdf_load_stackoverflow)
DE196505C (enrdf_load_stackoverflow)
AT62691B (de) Schaltungsanordnung für das Ausprüfen von Leitungen in Selbstanschluß- Fernsprechanlagen.
DE152462C (enrdf_load_stackoverflow)
DE112409C (enrdf_load_stackoverflow)
DE225563C (enrdf_load_stackoverflow)
DE238451C (enrdf_load_stackoverflow)
DE332577C (de) Elektrischer Sicherungs-Apparat gegen Einbruch, Diebstahl, Feuersgefahr usw.
DE171721C (enrdf_load_stackoverflow)