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Application filed by Julius BrotschneiderfiledCriticalJulius Brotschneider
Application grantedgrantedCritical
Publication of AT29946BpublicationCriticalpatent/AT29946B/en
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Claims (1)
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durch einen drehbaren Haken (11) festgehalten werden, der bei geöffneter Tür durch einen Elektromagneten 0) angezogen wird und in dieser Lage das Herabfallen der Platten (13). ermöglicht.
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be held by a rotatable hook (11) which is attracted by an electromagnet 0) when the door is open and in this position the panels (13) fall down. enables.
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AT29946D1906-08-211906-08-21
Device for the automatic Amziegen unauthorized opening of doors in hotels, houses and the like. like
AT29946B
(en)
Automatically report intrusion attempts and fire Automatic intrusion attempts and fire-reporting rigid protective surface. de rigid protective surface.