The team was founded in 1967 as a member of the Continental Football League and played in the Western Division.
[2] In May 1968, the Rangers signed a formal agreement with the Denver Broncos to act as a farm team of sorts for the AFL club.
Less than a year after attempting to purchase the Boston Patriots of the AFL, Rangers owner Lafa Lane announced his intention to sell a controlling interest in the Rangers.
With the end of the COFL in 1970, the Seattle Rangers also ceased operations although no official announcement was made.
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