who made the vacuum tubes
No, a perfect vacuum has not been made.
A vacuum is composed of empty space.
A vacuum is made of nothing. It is the absence of matter.
The Electrolux PU3450 Central Vacuum is probably the cheapest vacuum ever made.
The only kind of vacuum canister that a Dyson vacuum machine will take is one that is made by Dyson. These canisters are made especially for Dyson, and to date there are no competitors in the market.
Made in china
The first robotic vacuum cleaner was madde in 2002.
In 1996.
s
Millman's theorem
The Dyson DC01.