case harden
(metallurgy) To impart greater hardness to the surface of a piece of metal.
Snakelike. / Relating to snakes.
(idiomatic) by the way; now that I think about it; indicates something brought to mind.
Alternative form of grevillea (“tree of genus Grevillea”)
シャフトの表面を浸炭処理して摩耗抵抗を高めます。
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