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2. Central vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Central_vacuum_cleaner

   Cyclonic and filtered central vacuum systems are the two main types of central vacuums, differentiated by the method used to separate dirt and dust from the incoming airstream. [ 4 ] True cyclonic cleaners do not use filtration bags, instead separating the dirt and dust into a detachable cylindrical collection vessel or bin.

3. Tung-Sol - Wikipedia

   en.wikipedia.org/wiki/Tung-Sol

   2012 Russian production Tung-Sol brand 5881 type vacuum tube. The 5881 is a beam power tube designed by Tung-Sol and introduced in 1950. [129] The 5881 is an improved direct replacement for the 6L6 in any equipment originally using the 6L6 and facilitates new amplifier designs producing greater power output than those using 6L6's.

4. Vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Vacuum_cleaner

   The power unit of a typical central vacuum cleaner for residential use. Central vacuum cleaners, also known as built-in or ducted, are a type of canister/cylinder model which has the motor and dirt filtration unit located in a central location in a building, and connected by pipes to fixed vacuum inlets installed throughout the building.

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6. List of Mullard–Philips vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_Mullard–Philips...

   This is a list of European Mullard–Philips vacuum tubes and their American equivalents. Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme.

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