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PCE
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DIFF Subgroup
E04D 3/351

Full Title

Roof covering by making use of flat or curved slabs or stiff sheets (E04D1/00 takes precedence; built-up roofs E04D11/02) > Roofing slabs or stiff sheets comprising two or more layers, e.g. for insulation

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.