U. S. Patent No. 1,029,565, S. P. Wetherill and J. P. Wetherill,Jr. Application filed September 8, 19o6, allowed June 11, 1912期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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U. S. Patent No. 1,029,565, S. P. Wetherill and J. P. Wetherill,Jr. Application filed September 8, 19o6, allowed June 11, 1912

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