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| Patents Granted on 1983-12-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,419,824 | Dec. 13, 1983 | J. Oberhans | Digital Electrial Length Measuring Instrument | measurement gauges | |
| 4,420,677 | Dec. 13, 1983 | E.J. Partington | Heating system | ||
| CA-1,158,923 | Dec. 20, 1983 | M.J. Neal | Adjustable vortex pump | ||
| 4,421,443 | Dec. 20, 1983 | P.J. Finet, R.T. Woythal | High Speed Machine Tool Spindle Assembly | metalworking machine mechanisms | |