Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable

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Measuring instruments characterised by the use of mechanical techniques > Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable

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• G01B 3/48 for internal screw-threads
• G01B 3/50 of limit-gauge type, i.e. "go/no-go" (G01B3/48 takes precedence)