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File:Rockwell hardness tester 001.jpg
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پرونده:Rockwell hardness tester 001.jpg
Description
Rockwell
hardness
tester
001
.
jpg
A
Rockwell
Hardness
tester
. Date 2010 Source Own work Author Three-quarter-ten
پرونده:Rockwell hardness tester closeup 001.jpg
Description
Rockwell
hardness
tester
closeup
001
.
jpg
A closeup of the business end of a
Rockwell
-type
hardness
tester
. Date 2010 Source Own work Author