发明授权
- 专利标题： Boring bit and method for manufacture thereof
- 专利标题（中）： 镗头及其制造方法
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申请号： US416850申请日： 1982-09-13
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公开(公告)号： US4527449A公开(公告)日： 1985-07-09
- 发明人: William E. Sydlowski , Harold A. Trent
- 申请人： William E. Sydlowski , Harold A. Trent
- 申请人地址： MA Gloucester
- 专利权人： Rule Industries, Inc.
- 当前专利权人： Rule Industries, Inc.
- 当前专利权人地址： MA Gloucester
- 主分类号： B23B31/00
- IPC分类号： B23B31/00 ; B21K5/02 ; B23B51/00
摘要：
There are disclosed herein power tool boring bits having boring depth indicating markings on the shanks thereof. The markings are produced by colored oxiding of substantially the entire shank of the tool followed by selective abrasion of the shank to remove bands of substantially only the thin surface oxide in alternate array with bands of the colored oxide.
公开/授权文献
- US5077800A Electronic device for processing a sound signal 公开/授权日：1991-12-31
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