aperture restrictor

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orifice restrictor — A restrictor with a fixed aperture, passage, or hole meant to restrict the flow of fluid. This limiting of the flow of fluid causes the mechanism being operated by the system to move more slowly. See orifice check valve … Aviation dictionary
Ohm's law — This article is about the law related to electricity. For other uses, see Ohm s acoustic law. V, I, and R, the parameters of Ohm s law. Ohm s law states that the current through a conductor between two points is directly proportional to the… … Wikipedia
Pillar box — A pillar box is a free standing post box, in the United Kingdom, where mail is deposited to be collected by the Royal Mail and forwarded to the addressee. Similar designs exist as historical artefacts in certain Commonwealth of Nations countries … Wikipedia

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