YS

Yo Sumita

PK Pilot Precision Kabushiki Kaisha: 2 patents #4 of 8Top 50%
Overall (All Time): #2,358,321 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4452544 Mechanical pencil with automatic lead feed — 1984-06-05
4205924 Mechanical pencil with lead-feeding device operable by forward shake of pencil — 1980-06-03