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Total searches |
|
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| 2 | history of the pacemaker | 1 | 1 |
| 3 | how is static electricity produced | 1 | 1 |
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| 5 | mansions in minneapolis minnesota | 1 | 1 |
| 6 | how did dynamite help mankind | 1 | 1 |
| 7 | edison primary battery | 1 | 2 |