Machine Design
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

Internal bevel gears
Angular bevel gears
Crown bevel gears
Miter gears

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Machine Design
Turn buckle has

Right hand threads on bout ends
Left hand threads on one end and right hand threads on other end
No threads
Left hand threads on both ends

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