US Patent: 1,928,001
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| Projection Indicator Measuring Instrument
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Patentees:
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| Erik H. Aldeborgh (exact or similar names) - Poughkeepsie, NY |
| Park D. Ritchey (exact or similar names) - Poughkeepsie, NY |
| Lawrence G. Spealman (exact or similar names) - Poughkeepsie, NY |
| Christian E. Ruf (exact or similar names) - Poughkeepsie, NY |
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Patent Dates:
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| Applied: |
Sep. 15, 1931 |
| Granted: |
Sep. 26, 1933 |
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Joel Havens
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