Field investigations indicate that numerous relatively new wells are flawed particularly by leaky connections where there are connections and improperly placed sealant

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Field investigations indicate that numerous, relatively new wells are flawed, particularly by leaky connections (where there are connections) and improperly placed sealant.
9 USSR red dot sight made in steel

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9. USSR red dot sight, made in steel.
When Reidemeister was appointed as associate professor of geometry at the University of Vienna in 1923 he became a colleague of Wirtinger

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When Reidemeister was appointed as associate professor of geometry at the University of Vienna in 1923 he became a colleague of Wirtinger.