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Sierra Entertainment
Sierra Entertainment
(previously
Sierra On-Line
, commonly referred to as
Sierra
) is an
American
publisher
founded in 1979 as
On-Line Systems
by
Ken
and
Roberta Williams
. Based in
Oakhurst, California
and later in
Fresno, California
, the company is owned by
Activision
, a subsidiary of
Activision Blizzard
.
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