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Door bell/answering system

Communications: electrical – Condition responsive indicating system – Specified indicator structure
Patent

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Door block alarm

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door blocking brace and lock

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Door bolt alarm

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Door burglar alarm system

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door chime

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door closer having sound generating function

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door condition sensor for safes and secured areas

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Door control device with alarm switch

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

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Door entry security device with electronic lock

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Door excess weight alarm

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Door frame with integrated keyless entry system

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door gasket resistance based intrusion alarm system

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door guard with alarm device

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door knob alarm device

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door knob lock monitoring alarm mechanism

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door latch alarm

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door lock

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door lock alarm

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Door lock assembly

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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