Context: After many other more or less successful attempts with relatively weak rotating and reciprocating apparatus the Prussian Moritz von Jacobi created the first real rotating electric motor in May 1834 that actually developed a remarkable mechanical output power. His motor set a world record which was improved only four years later in September 1838 by Jacobi himself. His second motor was powerful enough to drive a boat with 14 people across a wide river. It was not until 1839/40 that other developers worldwide managed to build motors of similar and later also of higher performance.

Question: When were developers competing with Jacobi able to match his accomplishments?
Answer: 1839/40

Question: What was Jacobi's improved motor used to propel?
Answer: boat

Question: Who created the first real electric motor?
Answer: Moritz von Jacobi

Question: Who broke the world record set by Jacobi's first motor?
Answer: Jacobi himself

Question: How long did it take for Jacobi's first world record to be broken?
Answer: four years

Question: When were developers competing with Jacobi able to not match his accomplishments?
Answer: Unanswerable

Question:  What was Jacobi's improved motor used to not propel?
Answer: Unanswerable

Question:  Who created the first fake electric motor?
Answer: Unanswerable

Question:  Who broke the world record set by Jacobi's second motor?
Answer: Unanswerable

Question:  How long did it take for Jacobi's second world record to be broken?
Answer: Unanswerable