
A simple “opener” for metal cans with lacquer or varnish can be done in just a minute from block of wood and two nails.
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TESTER FOR BATTERIES
The device allows you to monitor the status of the galvanic cells and batteries: it measures the voltage under a nominal load. Diagram of the device is a voltage divider made from...
BUTTON+=CLIP
My way of fastening several sheets of paper, especially with a tight cover or tab, affordable, fast and reliable, so that will help out students or students who have to apply for...