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This is a list of vacuum tubes or thermionic valves, ... Q3.5 – Power tetrode up to 220 MHz, 3.5 kW; QQ-004/11 – Dual beam power tetrode up to 500 MHz, ...
This is a list of vacuum cleaners and robot vacuum cleaner manufacturers. A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors, and optionally from other surfaces as well. The dirt is gathered by either a dustbag or a rigid cartridge, which may be emptied and reused.
Lubrication of moving parts is a problem for vacuum. Many lubricants have unacceptable outgassing rates, [5] others (e.g. graphite) lose lubricating properties. Vacuum greases are greases with low outgassing. Ramsay grease is an old composition of paraffin wax, vaseline and natural rubber, usable up to about 25 °C, for low vacuums to about 1 Pa.
These are the top vacuum deals to score during Labor Day, including huge savings from Dyson, Shark, and iRobot. ... $330 $550 Save $220. See at Amazon. iRobot Braava Jet M6 (6110) $249 $450 Save $201.
Machlett Laboratories was a Northeastern United States-based company that manufactured X-ray and high-power vacuum tubes. Machlett was a large producer of the tubes and developed accessories to be used with them as well.
A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets, hard floors, and other surfaces. The dirt is collected into a dust bag or a plastic bin.
Ampex 601 playing a recording of "Les Paul's New Sound, Vol. II". Made in Redwood City, California, c. 1956. Internals of Ampex Fine Line F-44, a 3-head Ampex home-use audio tape recorder, c. 1965 AMPEX model 300 half-inch three-track recorder AMPEX 440 (2tr, 4tr) & 16-track MM 1000
The Autoluxlamp, a kerosene lamp manufactured by Lux and used in railway stations around the world in the early 20th century. The company originates from a merger of two companies—Lux AB and Svenska Elektron AB, the former an established manufacturer and the latter a younger company founded by a former vacuum salesman who had also been an employee of the former firm. [7]