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  2. Pager - Wikipedia

    en.wikipedia.org/wiki/Pager

    Pager. A pager, also known as a beeper or bleeper, [1] is a wireless telecommunications device that receives and displays alphanumeric or voice messages. One-way pagers can only receive messages, while response pagers and two-way pagers can also acknowledge, reply to, and originate messages using an internal transmitter. [2]

  3. Al Gross (engineer) - Wikipedia

    en.wikipedia.org/wiki/Al_Gross_(engineer)

    Al Gross (engineer) Irving " Al " Gross ( / ɡroʊs /; February 22, 1918 – December 21, 2000) was a pioneer in mobile wireless communication. He created and patented many communications devices, specifically in relation to an early version of the walkie-talkie, [1] Citizens' Band radio, [2] the telephone pager [2] and the cordless telephone. [3]

  4. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Telephone paging systems. Some private branch exchange (PBX) telephone systems use a paging facility that acts as a liaison between the telephone and a PA amplifier. In other systems, paging equipment is not built into the telephone system. Instead the system includes a separate paging controller connected to a trunk port of the telephone system.

  5. History of construction - Wikipedia

    en.wikipedia.org/wiki/History_of_construction

    The history of construction traces the changes in building tools, methods, techniques and systems used in the field of construction. It explains the evolution of how humans created shelter and other structures that comprises the entire built environment. It covers several fields including structural engineering, civil engineering, city growth ...

  6. Motorola Pageboy - Wikipedia

    en.wikipedia.org/wiki/Motorola_Pageboy

    Motorola Pageboy was the second pager produced by Motorola with individual-unit addressing, [clarification needed] after the lesser-known "Handie-Talkie Radio Pocket Pager" from 1955. [citation needed] The first pager-like system was used in 1921 by the Detroit Police Department. However, the first pager that we would today recognize as such ...

  7. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    The typical average baud rate is 10 bits per second, though the system will usually accept from about 9 through 13 pulses per second, a requirement due to variations in the rotary dial mechanism governor speed. This dialing method is the world's first mass scale digital addressing system.

  8. Motorola Minitor - Wikipedia

    en.wikipedia.org/wiki/Motorola_Minitor

    Motorola Minitor. Front view of the Minitor V pager. The Motorola Minitor is a portable, analog, receive only, voice pager typically carried by fire, rescue, and EMS personnel (both volunteer and career) to alert of emergencies. The Minitor, slightly smaller than a pack of cigarettes, is carried on a person and usually left in selective call mode.

  9. PocketBell - Wikipedia

    en.wikipedia.org/wiki/PocketBell

    Philippine Wireless Inc. introduced PocketBell in the 1970s, becoming the first company to make pagers commercially available in the Philippines. From the 1970s until the mid-1980s, it virtually maintained a monopoly in the pager industry in the country. After the 1986 People Power Revolution which deposed President Ferdinand Marcos and ...

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