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Well based on the fact that the very first patented rock crushing machine was made in the year 1830, and the first successful, Eli Whitney Blake's, was in 1858, I'd say the development process was around 30 years.
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Is a preamble, please can you kindly add the complete question, to know how to answer it in its correct form.
The disagreement for land ownership in the colonies and the control of the fur trade in the colonies were two factors that resulted in war between Britain and France.
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misunderstanding misbehaving etc
