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By certification 
gearing devices generally used in transmittin motion
between two axes which are operating neither in
parallel nor intersecting each other are worm gears,
hypoid gears and screw gears of which worm gears operate in line contact.
between two axes which are operating neither in
parallel nor intersecting each other are worm gears,
hypoid gears and screw gears of which worm gears operate in line contact.
