Context: Before the advent of the ASA system, the system of Weston film speed ratings was introduced by Edward Faraday Weston (1878–1971) and his father Dr. Edward Weston (1850–1936), a British-born electrical engineer, industrialist and founder of the US-based Weston Electrical Instrument Corporation, with the Weston model 617, one of the earliest photo-electric exposure meters, in August 1932. The meter and film rating system were invented by William Nelson Goodwin, Jr., who worked for them and later received a Howard N. Potts Medal for his contributions to engineering.

Question: What system was used previous to the ASA system?
Answer: the system of Weston film speed ratings

Question: Who devised the Weston film speed ratings? 
Answer: Edward Faraday Weston (1878–1971) and his father Dr. Edward Weston (1850–1936)

Question: What company did Dr. Edward Weston start? 
Answer: the US-based Weston Electrical Instrument Corporation

Question: When was the Weston model 617 created?
Answer: August 1932

Question: Who is credited with creating the film and meter system?
Answer: William Nelson Goodwin, Jr.

Question: Who introduced the ASA system?
Answer: Unanswerable

Question: When was the ASA system introduced?
Answer: Unanswerable

Question: When was William Nelson Goodwin Jr. born?
Answer: Unanswerable

Question: What medal did Edward Faraday Weston win?
Answer: Unanswerable

Question: What did Howard N. Potts invent in 1932?
Answer: Unanswerable