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  2. Salamander heater - Wikipedia

    en.wikipedia.org/wiki/Salamander_heater

    Salamander heaters date back to at least 1915. In the early 1940s, W.L. Scheu of Scheu Manufacturing Company, a producer of temporary portable space heating equipment, developed the modern salamander heater to provide warmth to allow construction crews to work in inclement weather. Sales spread across the US, and by the 1950s, to Europe.

  3. Patio heater - Wikipedia

    en.wikipedia.org/wiki/Patio_heater

    Distance from heater Propane and natural gas heaters Electric heaters 4 sq ft 1 foot 10,000 BTUs 1,000 Watts 16 sq ft 2 feet 36 sq ft 3 feet 64 sq ft 4 feet 100 sq ft 5 feet 46,000 BTUs 144 sq ft 6 feet 1,500 Watts 196 sq ft 7 feet 256 sq ft 8 feet 324 sq ft 9 feet Requires additional heater 400 sq ft 10 feet Requires additional heater

  4. Gas heater - Wikipedia

    en.wikipedia.org/wiki/Gas_heater

    Upright non-flued liquefied petroleum gas heater, 1970s A wall mounted gas heater that runs on either propane or natural gas. A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane. Indoor household gas heaters can be broadly categorized in one of two ways: flued or ...

  5. Sandia National Laboratories - Wikipedia

    en.wikipedia.org/wiki/Sandia_National_Laboratories

    One of Sandia's first permanent buildings (Building 800) was completed in 1949. Sandia National Laboratories' roots go back to World War II and the Manhattan Project.Prior to the United States formally entering the war, the U.S. Army leased land near an Albuquerque, New Mexico airport known as Oxnard Field to service transient Army and U.S. Navy aircraft.

  6. Smart bullet - Wikipedia

    en.wikipedia.org/wiki/Smart_bullet

    A smart bullet is a bullet that is able to do something other than simply follow its given trajectory, such as turning, changing speed or sending data. Such a projectile may be fired from a precision-guided firearm capable of programming its behavior.

  7. Air gun - Wikipedia

    en.wikipedia.org/wiki/Air_gun

    However, because compressed air is stored at higher pressures (up to 34 MPa or 4,900 psi) than liquid CO 2 (stored at around 8 MPa or 1,200 psi), HPA cylinders are more expensive. Cylinders smaller than 1.1 L (67 cu in ) may not even last as long as a standard CO 2 cartridge when subjected to frequent uses.