GB277574A
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Improvements in or relating to variable speed mechanism
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GB263319A
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Improvements in or relating to transmission gearing
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GB263320A
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Improvements in or relating to transmission gearing
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GB265881A
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Improvements in and relating to shifting mechanism for gears, dental clutches and the like
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GB261123A
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Improvements in or relating to transmission gearing
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GB206276A
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Improvements in controlling system for electro-magnetic transmission mechanism
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GB201063A
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Improvements in electro-magnetic transmission mechanisms
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