David H. E. Butler

KT Kabushiki Kaisha Toshiba: 1 patents #13,537 of 21,451Top 65%

BL Broken Hill Proprietary Company Limited: 1 patents #29 of 106Top 30%

Overall (All Time): #3,837,877 of 4,157,543Top 95%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
5263113	Method and apparatus for controlling the speed of a motor	Haruo Naitoh	1993-11-16