Arc spray tooling process mainly includes: master pattern preparation, surface pretreatment, fabrication of the metal shell, frame fabrication.

关键制模工艺包括：母模制备、金属型壳制造、模框制作、背衬强化层制作、脱模以及后处理等。

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The cast precious metal alloy or master alloy has been found to have a reduced number of hard spots and reduced silicon contamination when compared to conventional casting methods.

当与常规铸造方法相比时，发现铸造的贵金属合金或母合金具有数量减少的硬点和降低的硅污染。

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The mother of nylon lock, metal lock master, K cap, hex nut, cap-shaped, butterfly hats and all kinds of washers, retaining rings, pins and so on.

尼龙锁紧母、金属锁紧母、K帽、六角螺母、盖帽形、蝶形帽及各式垫圈、挡圈、销类等。

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Among the collection's thousands of metal and lacquer discs and master mono tapes are released and unreleased versions of recordings by such seminal artists as Louis Armstrong, Bing Crosby, Tommy Dorsey, Billie Holiday, the Andrews Sisters, Connee Boswell, Jimmy Dorsey, the Mills Brothers, Guy Lombardo, Ella Fitzgerald, Fred Waring, Judy Garland, and Dinah Washington, among others.

ENGADGET: Library of Congress receives 200,000 vintage master recordings from Universal, will stream them online