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Patent # US3428960
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 03:34, 28 August 2015 | (937 KB) | RobertG (Talk | contribs) | (Patent # US3428960) |
| 04:15, 26 August 2015 | (937 KB) | RobertG (Talk | contribs) | (Patent # US3428960) |
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