HH

Hans Helfrich

SA Siemens Aktiengesellschaft: 2 patents #6,658 of 22,248Top 30%
Overall (All Time): #2,287,417 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5423231 Foot control mechanism for a dental apparatus Hermann Landgraf, Josef Hain 1995-06-13
D342720 Foot switch Tilman Phleps, Hermann Landgraf 1993-12-28