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  • History of Technology - Electropaedia, Energy Sources and ...

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  • "Peking Review" - Massline.org Home Page

    'Peking Review' / 'Beijing Review' - the English language news weekly published in China since 1958. This site has over 1,300 entire issues in PDF format plus many hundreds of individual separate articles, especially on politics, philosophy and political economy, mostly from the Mao era.

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  • Trip hammer - Wikipedia

    In ancient China, the trip hammer evolved out of the use of the mortar and pestle, which in turn gave rise to the treadle-operated tilt-hammer (Chinese: Pinyin: dui; Wade-Giles: tui).

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  • Technologies de l'information et de la communication — Wikipédia

    Histoire. Après les premiers pas vers une société de l'information qu'ont été l'écriture puis l'imprimerie, de grandes étapes ont été le télégraphe électrique, puis le téléphone et la radiotéléphonie.

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  • Crusher - Wikipedia

    A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust.. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can ...

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