The stipple shading is intended to represent an alternate surface material that is different from that of the areas that have straight-line shading.
The stipple shading is intended to represent an alternate surface material that is different from that of the areas that have straight-line shading.
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Number | Date | Country | |
---|---|---|---|
Parent | 29225142 | Mar 2005 | US |
Child | 29262091 | US |