Question: When did the king size bed come out?
Disambiguated questions and answers: question: When did the king size bed come out and become standardized?
When did the king size bed first come out?
answer: mid-1950s
1950s and 60s
1950s and 1960s
mid 1940s
mid-1940s
question: When were king sized beds standardised in North America?
When were king sized beds introduced by manufacturers in North America?
answer: mid-1950s
1950s and 1960s
mid 1940s
mid-1940s
Natural Questions answer: mid-1950s (from the Wikipedia article "Bed")