| Patents Granted on 1990-05-?? |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 4,920,723 | May 01, 1990 | D.R. Porter | Hollow Granite Box Beam and Method of Forming | manufacturing processes |
| 4,922,574 | May 08, 1990 | J.A. Parise, G.R. Slivon, C.H. Heiligenthal | Caster Locking Mechanism and Carriage | |
| 4,924,737 | May 15, 1990 | S.A. Gommow | Positive Drive Ratchet | ratchet wrenches |
| 4,926,556 | May 22, 1990 | R. Landy, A. Carsello, E.A. Pilatowicz | Hand held trimmer for cutting vegetation such as hedges and the like | |
| 4,926,557 | May 22, 1990 | E.J. Haupt | Semi-automatic string trimmer head | |
| 4,928,937 | May 29, 1990 | L.M. Bernstein | Multi-purpose machine vise | metalworking machine vises |
| 4,929,082 | May 29, 1990 | G.B. Webber | Laser Linear Distance Measurement System and Apparatus | optical measuring gauges |
