Zhang Yuhai (张玉海)

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Comrades, we must resolutely achieve safe production - safe production wall chart 1

Comrades, we must resolutely achieve safe production - safe production wall chart 1 (1964, December)

Unsafe parts of machinery must have protective covers -- safe production wall chart 10

Unsafe parts of machinery must have protective covers -- safe production wall chart 10 (1964, December)

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