I want to know the answer to the following question:
What was Samuel Crompton's invention of 1775?
All the background I'm provided with is that "Later, the invention of the James Hargreaves' spinning jenny in 1764, Richard Arkwright's spinning frame in 1769 and Samuel Crompton's spinning mule in 1775 enabled British spinners to produce cotton yarn at much higher rates.". Is that enough to answer the question?