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US2484972A
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Optical comparison projecting apparatus having interchangeable objectives and condensers
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US2373929A
|
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Projection apparatus
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US2373928A
|
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Episcopic illuminating device
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US2373930A
|
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Optical control apparatus
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GB543878A
|
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Boring or drilling and like machine tools
|
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GB502123A
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Improvements in and relating to machines for grinding the relieved threads of screw-cutting hobs and taps
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GB427530A
|
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Improvements in means for clamping a tool to the tool spindle of machine-tools and for ejecting the tools
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GB427064A
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Improvements in and relating to trueing the grinding surface of the grinding wheels of screw thread grinding machines
|
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GB415973A
|
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Improvements in measuring-devices for measuring the movements of machine parts
|
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US1775952A
|
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Measuring device in connection with boring machines
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US1400331A
|
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Instrument adapted to disclose the difference actually existing between pieces whichshould be of the same actual size
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