annular tapered groove

annular tapered groove: 1) Техника: кольцевая конусообразная канавка, кольцевой конусообразный паз

2) Макаров: кольцевая канавка, кольцевой паз

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Spark plug — A spark plug (also, very rarely nowadays, in British English: a sparking plug) is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark.… … Wikipedia
stringed instrument — a musical instrument having strings as the medium of sound production, played with the fingers or with a plectrum or a bow: The guitar, the harp, and the violin are stringed instruments. * * * Any musical instrument that produces sound by the… … Universalium

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