DIFF Subgroup Additional Only
Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
Full Title
Stock material or miscellaneous articles > Web or sheet containing structurally defined element or component > Composite having voids in a component [e.g., porous, cellular, etc.]
Of 14 combined children, 0 exist in both systems.
14 codes are CPC-only extensions.
Note: 14 CPC extensions are marked as secondary classification only.