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NF Circuit Design Block Co., Ltd. Patents
NF Circuit Design Block Co., Ltd.
Yokohama, JP
No. of patents:

Patent Number Title Of Patent Date Issued
4478538 Device for detecting tool abnormality October 23, 1984
When a drill is overloaded, while cutting a hole in a workpiece, a torque limiter disconnects the drill from a main spindle. As the drill is disconnected from the main spindle, the torque limiter generates high-level elastic waves. The elastic waves are converted by a transducer into

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