Talk:RKM code

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This article is probably better off in Wiktionary, as it is merely a definition and not an encyclopedic entry. Tanthalas39 (talk) 05:25, 2 March 2008 (UTC)[reply]

On second though, maybe not. Not sure... just expansion and cleanup, I guess. Tanthalas39 (talk) 05:28, 2 March 2008 (UTC)[reply]

Here are a few historically interesting questions not answered by the article yet and thus needing further research:

Was there a history of the RKM code prior to its standardization in IEC 62:1952 in 1952? It isn't mentioned in Buttner's handbook in the 1943 and 1946 editions (not checked later editions). Does this indicate that the notation was freshly invented for IEC 62:1952? By whom?
In the AWS/JAN tolerance code, the letters G, J, K, M were used for the tolerances 2%, 5%, 10%, 20%. Why were exactly these letters chosen and not some others? Why did the AWS/JAN specs not already include letters for 1% (F?) and 3% (H?)? What have been the exact names of those AWS/JAN specs?