With the onset of heat when the furnace in country houses no longer burn in their pipes often, birds build nests. In the fall and the owners wonder why the furnace began to smoke. This will not happen if access to fix the chimney block, metal mesh: it will protect the pipe from the birds, and the deadlift no impact.
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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...
