PHOTOELECTRIC AUTOCOLLIMATORS FOR USE IN MONITORING, ALIGNING, MEASURING, OR CONTROLLING ANGULAR POSITION SUCH AS ALIGNING OPTICAL ELEMENTS, CHECKING SQUARENESS AND PARALLELISM OF SURFACES, DETECTING MINUTE DISTORTIONS AND DEFLECTIONS IN STRUCTURAL MEMBERS, TESTING ANGLE-RESPONSIVE DEVICES, ETC

'align':7,15 'angl':34 'angle-respons':33 'angular':11 'autocollim':2 'check':18 'control':10 'deflect':28 'detect':24 'devic':36 'distort':26 'element':17 'etc':37 'measur':8 'member':31 'minut':25 'monitor':6 'optic':16 'parallel':21 'photoelectr':1 'posit':12 'respons':35 'squar':19 'structur':30 'surfac':23 'test':32 'use':4

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