RD

Roger F. Laurence, deceased

ND National Research Development: 1 patents #307 of 1,071Top 30%
📍 Camberley, GB: #45 of 158 inventorsTop 30%
Overall (All Time): #2,314,768 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4996712 Hearing aids Leon Morgan 1991-02-26
4517415 Hearing aids — 1985-05-14