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Testing "go" end of a limit plug gauge.

Plug Gauge

Testing "go" end of a limit plug gauge.

"Stepped gage, a form of male or plug gage in which a series of external gages are combined, each projecting like a step beyond that next in front of it." -Whitney, 1911

Stepped Gauge

"Stepped gage, a form of male or plug gage in which a series of external gages are combined, each projecting…