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The interface for STEP supports all the classes listed during import; however, only classes 1 and 8 are supported for export.
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Class
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Description
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1
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Drawing structure and administration plus the presentation of annotation on drawing sheets without views
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2
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Drawing structure and administration plus the presentation of views depicting the shape, represented by geometrically bounded 2D wireframe models, of one or more products on drawing sheets
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3
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Drawing structure and administration plus the presentation of views depicting the shape, represented by 2D wireframe models with topology, of one or more products on drawing sheets
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4
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Drawing structure and administration plus the presentation of views depicting the shape, represented by geometrically bounded 3D wireframe and/or surface models, of one or more products on drawing sheets
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5
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Drawing structure and administration plus the presentation of views depicting the shape, represented by 3D wireframe models with topology, of one or more products on drawing sheets
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8
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Drawing structure and administration plus the presentation of views depicting the shape, represented by advanced B-reps models, of one or more products on drawing sheets
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9
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Drawing structure and administration plus the presentation of views depicting the shape, represented by manifold surface models with topology, of one or more products on drawing sheets
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10
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Class 2 and the association between dimensions, drafting callouts, and fill area boundaries and their respective target product shape geometry or annotation
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