d-2.1 the testing apparatus shall be capable of applying an indentor in such a way that the load applied on the sample shall be at the rate of 0'5 kgf/min and shall have a dial scale platform balance of suitable capacity for measuring the load required to produce the specified inden- tation. the sample...
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railroad telegraph system. because there was only one telegraph line linking all railroad stations , there needed to be a way to address each one when sending a telegram . in order to save time, two-letter identifiers were adopted for this purpose. this pattern continued in radiotelegraph operation; radio...
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