More on the results of vacuum pumps:

Billion-dollar mistake: How inferior IT killed Target

Eventually, Target's board had enough and Steinhafel, a 35+ year veteran of Target, was out. Brian Cornell, who had previously been the boss at Sam's Club, was installed as the new Target CEO....<<more>>

Photos: 100 years of computing from punched cards to

Before vacuum tubes, or thermionic valves, became the norm for logic switching in computers IBM built equipment from electromechanical devices, such as the counter seen here.writ large: using...<<more>>

three target big size vacuum tube for solar collector

thermal solar vacuum tube - thermal solar vacuum tube for sale. solar vacuum tube , supply solar vacuum tubes , big solar vacuum tube ,three target solar vacuum tube solar vacuum tube collector 500l purple so...<<more>>

Vacuum tube - Wikipedia

In electronics, a vacuum tube, an electron tube, or colloquially a tube (North America) or valve (British usage), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied....<<more>>

China solar vacuum tube wholesale ???? - Alibaba

China Solar Vacuum Tube, China Solar Vacuum Tube Suppliers and Manufacturers Directory - Source a Large Selection of Solar Vacuum Tube Products at solar evacuated tube ,solar tube ,vacuum tube amplifier from China Alibaba...<<more>>

From Tubes To Transistors - Computer History 101: The

The three main components of a basic triode vacuum tube. The type of tube used in early computers was called a triode and was invented by Lee De Forest in 1906....<<more>>

Amazon: Small Vacuum Cleaners

Use this vacuum cleaner for both carpets andAmazon's Choice for "Small Vacuum Cleaners" VonHaus 2 in 1 Corded Lightweight Stick Vacuum Cleaner and Handheld Vacuum Bagless with HEPA Filtration, Crevice Tool and Brush Accessories - Ideal for Hardwood Floors...<<more>>

Vacuum - Wikipedia

Hard vacuum and soft vacuum are terms that are defined with a dividing line defined differently by different sources, such as 1 Torr, or 0.1 Torr, the common denominator being that a hard vacuum is a higher vacuum than a soft one....