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Invention Grant
US956474A Device for forming square holes. 失效
形成平方孔的装置

  • Patent Title: Device for forming square holes.
  • Patent Title (中): 形成平方孔的装置
  • Application No.: US1909519959
    Application Date: 1909-09-28
  • Publication No.: US956474A
    Publication Date: 1910-04-26
  • Inventor: BROWN CHARLES A
  • Applicant: BROWN CHARLES A
  • Assignee: Charles A Brown
  • Current Assignee: Charles A Brown
  • Priority: US1909519959 1909-09-28
Device for forming square holes.
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