DS

David F. Spence

AP Ae Plc: 1 patents #28 of 61Top 50%
Overall (All Time): #3,927,919 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
4830719 Method for etching piston rings David Robert Adams, Johnathan D. Philby, Alan D. Pope, David R. Eastham 1989-05-16