Magnet from old speakers, glued with epoxy glue to the strap from the watch, will allow you to free your hands when performing such work as repair of footwear, mending roof or door trim. M. ANDREEV
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Using the principle of producing hydrogen by electrolysis of aqueous alkali, as described in the journal "modelist-Konstruktor" No. 7 for 1980, I decided to make more simple and compact...
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Sometimes you need to control the lights (or other devices) of two points far remote from each other. It may be required in the long corridor, and in the garden, or even in a small...
