De Forest put a metal grid in the middle of the vacuum tube. By using a small input current to change the voltage on the grid, De Forest could control the flow of a second, more powerful current ...
landscape pavers and other materials with the Vacuworx SL 2 subcompact lifting system The next-generation SL 2 Subcompact Vacuum Lifting System has an improved hydraulic system and modular pads to ...
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