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Backup arrangement for alarm system

Communications: electrical – Condition responsive indicating system – With particular system function
Patent

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Barrier movement position sensing

Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate

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Battery backed service indicator aids for field maintenance

Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate

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Battery backed service indicator aids for field maintenance

Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate

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Beat frequency interference rejection circuit

Communications: electrical – Condition responsive indicating system – With particular system function
Patent

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Bidirectional communication between control element and...

Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate

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Bidirectional, interactive fire detection system

Communications: electrical – Condition responsive indicating system – With particular system function
Patent

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Building automation systems and methods

Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate

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Building emergency simulator

Communications: electrical – Condition responsive indicating system – With particular system function
Patent

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Building security system

Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate

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Burglar alarm with re-entry feature

Communications: electrical – Condition responsive indicating system – With particular system function
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