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  2. Rotary switch - Wikipedia

    en.wikipedia.org/wiki/Rotary_switch

    Thus a rotary switch provides greater pole and throw capabilities than simpler switches do. Rotary switches were used as channel selectors on television receivers until the early 1970s, as range selectors on electrical metering equipment, as band selectors on multi-band radios, etc. Modern rotary switches use a "star wheel" mechanism to provide ...

  3. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.) EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges.

  4. List of Chinese inventions - Wikipedia

    en.wikipedia.org/wiki/List_of_Chinese_inventions

    Blast furnace: Although cast iron tools and weapons have been found in China dating from the 5th century BC, the earliest discovered Chinese blast furnaces, which produced pig iron that could be remelted and refined as cast iron in the cupola furnace, date from the 3rd and 2nd centuries BC, and the vast majority of early blast-furnace sites ...

  5. Elma Electronic - Wikipedia

    en.wikipedia.org/wiki/Elma_Electronic

    Elma VXS backplane. Elma Electronic is a publicly traded Swiss electronics company founded in 1960 and based in Wetzikon, Switzerland.The company has 5 product divisions: Systems Platforms, Backplanes, Enclosures & Components, Rotary Switches, and Cabinet Enclosures.

  6. Trimline telephone - Wikipedia

    en.wikipedia.org/wiki/Trimline_telephone

    Touch-Tone/dial pulse switch, eliminating separate Touch-Tone and rotary models; Redial and Mute functions; One cord to connect telephone is eliminated, base-to-handset and base-to-jack cords reinstated; 1986 With the closing of the Western Electric Indianapolis Works, Trimline production is moved overseas to Singapore and China. Minor ...

  7. Stepping switch - Wikipedia

    en.wikipedia.org/wiki/Stepping_switch

    Stepping switches were widely used in telephony and industrial control systems when electromechanical technology was paramount. A basic stepping switch is an electrically operated rotary switch with a single (typically input) terminal, and multiple (typically output) terminals. Like other typical rotary switches, the single terminal connects to ...

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  9. Rotary system - Wikipedia

    en.wikipedia.org/wiki/Rotary_system

    The Rotary and Panel systems were very different systems, but both used the same newly developed component technology, such as Western Electric's latest relays, and the principles of the Lorimer system [1] of revertive pulsing and preselection. [2] The Rotary switches were smaller than the Panel system, and served only 200 rather than 500 stations.