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    A friend who worked in the grinding department at...

    A friend who worked in the grinding department at Sunnen described making plates, I think for internal use by the inspection dept. He blued one and rubbed them together, then scraped the blue points,...
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    Jerry speaks in sooth. The technique has been...

    Jerry speaks in sooth. The technique has been developed to the extent that optical people can hand grind glass mirrors and lenses correct to a few light waves.

    An English teacher, who...
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