| 摘要 |
484,976. Felt ; testing fabrics. ALEXIS, C., and SOC. ANON. DES FEUTRES & AMIANTES D'AUVELAIS. Dec. 15, 1937, No. 34767. Convention date, Oct. 23. [Class 42 (ii)] A polishing felt is examined before an X-ray screen for impurities and defects, the faulty parts are removed, e.g. by the use of a hollow punch, and the holes filled in with sound pieces of felt rather larger than the holes.
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