Patent classifications
C
CHEMISTRY; METALLURGY
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C03
GLASS; MINERAL OR SLAG WOOL
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C03B
MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
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2203/00
Fibre product details, e.g. structure, shape
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C03B2203/10
Internal structure or shape details
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C03B2203/14
Non-solid, i.e. hollow products, e.g. hollow clad or with core-clad interface
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