FIELD: mechanical engineering. SUBSTANCE: pattern has sheet of flexible material with holes for applying pattern therethrough. The sheet is provided with coating resistant to abrasive material at one side. At the other side it is coated with material possessing ferromagnetic properties. Applied to ferromagnetic coating at the circumference of sheet and/or holes are layers of shock-absorbing sealing material. EFFECT: enhanced efficiency of the device. 5 cl, 7 dwg
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Authors
Dates
1994-07-30—Published
1991-12-18—Filed