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2. Model 500 telephone - Wikipedia

   en.wikipedia.org/wiki/Model_500_telephone

   Internal components of a model 500 produced in 1951 The 425A network component of a model 500 produced in 1951. The 500-type telephone consists of a rotary dial, a handset cradle, switch hook, and a handset (sometimes called the receiver) wired to the base and has a molded plastic housing covering a steel chassis. The user interface consists of ...

3. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Wireless home alarm system control panel A house alarm. A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary or property damage, as well as against intruders.

4. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   The Victory Siren manual stated that when a manual generation of the warbling tone was required, it could be achieved by holding the "Signal" switch on for 8 seconds and off for 4 seconds. In 1950, the Federal Civil Defense Administration revised the signals, naming the alert signal "red alert" and adding an "all clear" signal, characterized by ...

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