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15.2.3.

[71, 128, 148, 144] , .

. 15. 8. , .

. 15.8; , , . , , , , . , , .

, , . , . ; ; .

. : , , . , : Impregnated Diamond Products, Wickman G. . N Welsh Metal Industries. [114].

. , . , , , , .

. 15.8 , ; . , , [82].

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