Context: In 1963, Ralph J. Roberts in conjunction with his two business partners, Daniel Aaron and Julian A. Brodsky, purchased American Cable Systems as a corporate spin-off from its parent, Jerrold Electronics, for US $500,000. At the time, American Cable was a small cable operator in Tupelo, Mississippi, with five channels and 12,000 customers. Storecast Corporation of America, a product placement supermarket specialist marketing firm, was purchased by American Cable in 1965. With Storecast being a Muzak client, American Cable purchased its first Muzak franchise of many in Orlando, Florida.

Question: When did Ralph Roberts get into the cable TV business?
Answer: 1963

Question: Who were Roberts' business partners in this purchase?
Answer: Daniel Aaron and Julian A. Brodsky

Question: What company did this partnership purchase?
Answer: American Cable Systems

Question: What city did American Cable Systems do business in?
Answer: Tupelo, Mississippi

Question: How many customers did ACS have when Roberts and his partners purchased it?
Answer: 12,000

Question: How much was Jerrold Electronics?
Answer: Unanswerable

Question: Which two partners owned Jerrold Electronics?
Answer: Unanswerable

Question: How many customers did Storecast Corporation of America have in 1963?
Answer: Unanswerable

Question: What did Ralph J. Roberts sell in 1963?
Answer: Unanswerable

Question: American Cable Systems was the parent company of what spin-off?
Answer: Unanswerable