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| 3815171 | Carr et al. | Jun 1974 | |
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| 3913168 | Lovgren | Oct 1975 | |
| 3916476 | Johnson et al. | Nov 1975 | |
| 3942219 | Johnson | Mar 1976 | |
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| 4091496 | Desrosiers et al. | May 1978 | |
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