
to insert the keys in the front door on a dark landing, and requires some kind of illumination. Well, when a box of matches or a lighter. This problem will not arise, if the door closer to the lock pin miniature flashlight button: fortunately now there are many suitable options fobs illuminated.
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OBJECTIVE EXAMINER
In the sixth issue of our magazine in 1974 we told about the device "Pulse" for the control of knowledge of students. Practice operating the machine created by the participants NTTM...
AND TO DRAW AND STORE
A thin drawing pen tool is fragile, and inserted in a normal pen, easily spoiled by careless storage. Better to use it with the handle, and with a collet Chuck: and is held securely,...