Standard Reference Materials: The First Century (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Standard Reference Materials: The First Century

Numbering of Standard Samples and Standard Reference Materials has been assigned according to several different sys tems during the first century of production and certification. Almost all of the first 100 srms were completed before 1930 and assigned numbers more or less in sequence, with the exception of the first four standard samples (as was discussed in the main text). Occasionally a number was reserved for a certain srm, such as 85 for aluminum alloy (duralumin) first issued in 1943, that had a delayed issue or was not issued at all. In a few cases, numbers for unissued materials and srms that were issued but discontinued have been reused for different materials.

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