The latest draft of ISO 10303-51 Mathematical Description can be browsed. This is identical to document ISO TC184/SC4/WG12 N913 of 2001-05-03.
Alternatively you can download the complete document as a zipped file. Please unzip the file into an empty directory.
Part 51 has been issued by ISO TC184/SC4 for CD ballot. The ballot ends on 2001-09-18.
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