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Charles Kettering
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| Number | Title | Issue Date |
| 4947557 | Coordinate measuring machine A coordinate measuring machine comprises a base (1), a portal (3), a rigid cross member (13) associated with posts (4, 5) of the portal (3), a mechanisms (14) for placement of the portal (3) interacting with the member (13), a measuring system of displace... | 08/14/1990 |