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The History of Gauge Blocks
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0.109" - 4" Gauge Block Set Johansson slip gauges, C.E Johansson Inc. (Division of Ford)
The History of Gauge Blocks
Worker is calibrating to vernier caliper with gauge block. Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. Stock Photo