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Central vacuum cleaning tools and hose (partially covered by a protective gray "hose sock") Baseboard-level vacuum dustpan inlet (Israel) Central vacuums can be equipped with either an electrical power brush or an air-driven power brush.
Street elbows are available with bend angles of 90°, 45°, and 22.5°. They can be used in many plumbing applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump pump drains, and other locations where plumbing fittings would be used to join sections of pipe.
A Curristor vacuum tube that had four types of nitrogen-filled, radioactive constant-current tubes with a current plateau from 25 to 500 V, all-glass wire-ended, active material is 226Ra with a half-life of 1601 years, for linear capacitor charging and draining in missile and ordinance mine timing circuits, instrumentation biasing, as current ...
Fittings for central vacuum systems are similar to DWV fittings but usually have thinner and lighter construction because the weight of the materials conveyed is less. Vacuum-system designs share with DWV designs the need to eliminate internal ridges, burrs, sharp turns, or other obstructions which might create clogs.
Fred A. Lennon and Cullen B. Crawford founded Crawford Fitting Company in Cleveland, Ohio, in July 1947 to manufacture the Swagelok tube fitting, which used a two-ferrule design to “swage” or form the tube and lock it into place. One year later, Lennon bought out Crawford and continued to grow the business.
Last US pit-cast jib crane to operate in the casting of iron pipe. 1905 Birmingham: Alabama United States ASME brochure: 24: 1977 State Line Generating Unit 1. World's largest electric-power generator for nearly 25 years, achieving many design firsts. 1929 Hammond: Indiana United States ASME brochure: 25: 1977 Pratt Institute Power Plant
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