Boeing will buy Bingen-based Insitu, which designs, develops and manufactures unmanned air systems.

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ST. LOUIS — Boeing said today that it will acquire aircraft design and development company Insitu for undisclosed terms to help boost its presence in the unmanned systems market.

Insitu — based in Bingen, Klickitat County — designs, develops and manufactures unmanned air systems, or aircraft that operate without a pilot, for commercial and military applications.

The purchase is expected to close by the end of September, following regulatory approval.

Boeing said the purchase does not affect its outlook and said Insitu will operate as a separate subsidiary.