Helmut Hackl

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Munich, DE

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Patents Grantslast 30 patents

Information Patent Grant
Drill comprised of hard metal for drilling contact holes in circuit...
- Patent number 4,231,692
- Issue date Nov 4, 1980
- Siemens Aktiengesellschaft
- Bernhard Brabetz
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of producing holes free of accretions in circuit boards made...
- Patent number 4,190,386
- Issue date Feb 26, 1980
- Siemens Aktiengesellschaft
- Bernhard Brabetz
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR