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Manual vacuum cleaner. The manual vacuum cleaner was a type of non-electric vacuum cleaner, using suction to remove dirt from carpets, being powered by human muscle, similar in use to a manual lawn mower. Its invention is dated to the second half of the 19th century, when patents were granted to inventors in the United States, Britain, France ...
1.5 Handheld vacuum cleaners. 2 Vacuum cleaner manufacturers. 3 See also. 4 References. 5 External links. Toggle the table of contents. List of vacuum cleaners. Add ...
Vacuum drying is the mass transfer operation in which the moisture present in a substance, usually a wet solid, is removed by means of creating a vacuum. In chemical processing industries like food processing , pharmacology, agriculture, and textiles, drying is an essential unit operation to remove moisture. [1]
January 2008; 16 years ago. ( 2008-01) Current status. Defunct. A coupon-eligible converter box ( CECB) was a digital television adapter that met eligibility specifications for subsidy "coupons" from the United States government. The subsidy program was enacted to provide terrestrial television viewers with an affordable way to continue ...
AN/PRC-77 Portable Transceiver. AN/PRC 77 radio and handset. Soldier using a PRC-77 (top) with the KY-38 "Manpack," part of the NESTOR voice encryption system that was used during the Vietnam War. U.S. Marine carrying a PRC-77 during a training exercise in 1989. AN/PRC 77 Radio Set is a manpack, portable VHF FM combat-net radio transceiver ...
The US names "vacuum tube", "electron tube", and "thermionic tube" all simply describe a tubular envelope which has been evacuated ("vacuum"), has a heater and controls electron flow. In many cases, manufacturers and the military gave tubes designations that said nothing about their purpose (e.g., 1614).