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D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
D01H—SPINNING OR TWISTING
D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
D01H5/32—Regulating or varying draft
D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities
D01H5/385—Regulating or varying draft in response to irregularities in material ; Measuring irregularities employing hydraulic or pneumatic time-delay devices