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Patents for Hans Ernst
Patents 91 - 92 of 92
Number	Date	Patentee	Title	Type
2,903,922	Sep. 15, 1959	W.A. Haggerty, H. Ernst	Self-Centering Drill	drill bits
3,037,329	Jun. 05, 1962	W.A. Haggerty, E.L. Ritter, H. Ernst	Method and Apparatus for Grinding Drills	drill sharpening machines

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