| Business Name | Address | |
| Advantagetel Communications | 46 Central St Winthrop, ME 04364 |
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| Cameron Electric | RR 135 E Winthrop, ME 04364 |
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| Steve Kaplan Electric | 190 State Route 133 Winthrop, ME 04364 |
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| Dan Kaplan Electric | 190 Route 133 Winthrop, ME 04364 |
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| Winthrop Electric | 39 Cross Rd Winthrop, ME 04364 |
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