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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
G01B 11/14

for measuring distance or clearance between spaced objects or spaced apertures (G01B11/26 takes precedence; rangefinders G01C3/00)

Full Title

Measuring arrangements characterised by the use of optical techniques > for measuring distance or clearance between spaced objects or spaced apertures (G01B11/26 takes precedence; rangefinders G01C3/00)