| 摘要 |
PROBLEM TO BE SOLVED: To easily indicate time for replacement. SOLUTION: A foundation cloth 31 is tufted with twisted yarn comprising a spun yarn of cotton 35 of 80 wt.% and a red-dyed nylon filament 36 of 20 wt.% to form a fiber layer 32 of a thickness of approximately 1 cm on the surface of the foundation cloth 31. A backing material 33 of felt is arranged on the undersurface of the foundation cloth 31.
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