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EntityQ3509055· pop 6· linked from 481 articles

Also known as .step, .stp, .p21, Standard for the Exchange of Product model data, STEP CAD interchange format, ISO 10303-21

file format

Described at

STEP interchange format

paulbourke.net

Plain text file format. Based on EXPRESS language schema. Deals with named objects rather than just raw geometric information.

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file extension
p21
media type
application/octet-stream
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