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Vacuum tube - wikipedia, In electronics, a vacuum tube, an electron tube, or just a tube (north america), or valve (britain and some other regions), is a device that controls electric current.
Build a simple solar water heater | iwilltry.org, Introduction i've seen a few different designs for solar water heaters and i wanted to share my own. it is quite an efficient design since every square inch of.
Solar thermal collector - wikipedia, A solar thermal collector collects heat by absorbing sunlight. a collector is a device for capturing solar radiation. solar radiation is energy in the form of.
How to build a solar bottle bulb 2.0 ( updated english, Thanks to marco bieman from bieman production haus inc. video directing and editing 63-02-5029766 & joy aquino for visual directing. amazing work ! 1.
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