Definition of back shaft
1
: a countershaft driven by a back gear
2
: any shaft placed at the back of a machine
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“Back shaft.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/back%20shaft. Accessed 22 May. 2022.
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Time Traveler for back shaft
The first known use of back shaft was in 1847
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