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Santa Ana-based Secure Technology Co. was sold to Benchmark Electronics Inc. for $230 million in cash by its private equity owner, Vance Street Capital LLC.

Secure Technology makes “ruggedized” computer equipment for military, government, and oil and gas companies.

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Benchmark, based near Houston, provides design, engineering and manufacturing services to equipment makers in the aerospace, defense, telecommunications, and medical device industries. It traded recently at a $1 billion market cap.

Los Angeles-based Vance Street bought Secure in 2009 and in 2013 added Lark Engineering in San Juan Capistrano and Smart Electronics in Anaheim to the fold. Vance Street invests in industrial, aerospace and defense, and medical device firms.