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Eye refractometers. Technical requirements and test methods

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Ophthalmometers. Technical requirements and test methods

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Non-falling-out screws with flat for `width across flats`, product grade B. Construction and dimensions

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Solid electroinsulating materials. Method for the determination of arc resistance of alternating voltage greater than 1000 V

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Solid electroinsulating materials. Method for the determination of arc resistance of direct voltage up to 1000 V

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