| DOCTER 0847925 · TMA514959 | DOCTER OPTICS GMBH | 7 Machines9 Electronics11 Lighting+1 | Registered | 1999 |
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| DECTROME 1653515 · TMA1027481 | GLAXO GROUP LIMITED | 5 Pharmaceuticals44 Medical | Registered | 2019 |
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| DEXTREME 2134301 | 9459-4488 Québec Inc. | 4 Oils11 Lighting22 Ropes | Pending | 2021 |
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| DOGTRA 2006299 · TMA1279923 | SOS Co. Inc. | 9 Electronics | Registered | 2025 |
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| DXTREME 1614097 · TMA893895 | Frontier Fashion, Inc. | 9 Electronics14 Jewellery18 Leather+1 | Registered | 2015 |
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| DISTREX 1497887 · TMA866378 | 2253404 Ontario Ltd. | 35 Advertising | Registered | 2013 |
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| DEXTRE 0914912 | Canadian Space Agency | All goods and services | Protected | 2003 |
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| DOCTEUR 0913000 | The Canadian Medical Association/Association médicale canadienne | All goods and services | Protected | 2001 |
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| DOCTOR 0912998 | THE CANADIAN MEDICAL ASSOCIATION / ASSOCIATION MÉDICALE CANADIENNE ("CMA") | All goods and services | Protected | 2001 |
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| DOCTOR 0907423 | CANADIAN MEDICAL ASSOCIATION/ASSOCIATION MÉDICALE CANADIENNE | All goods and services | Protected | 1995 |
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| DECTRON 0896995 · TMA522500 | SOLUTIONS D'AIR DÉSHUMIDIFIÉ INC./DEHUMIDIFIED AIR SOLUTIONS INC. | 9 Electronics | Registered | 2000 |
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| DocuTRACK 1561886 · TMA871839 | Keal Inc. | 9 Electronics42 Science | Registered | 2014 |
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| DOCTOROID 2283311 · design | Owner not listed | 25 Clothing | Pending | 2023 |
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| DOCTORSOLVE 1187444 · TMA632915 | Doctorsolve Health Care Solutions Inc. | 35 Advertising39 Transport44 Medical | Registered | 2005 |
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| DOCTORLOAN 2154350 · TMA1191085 · design | an individual | 10 Medical20 Furniture | Registered | 2023 |
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| DECOTRAY 2103247 · TMA1188415 | an individual | 16 Paper20 Furniture | Registered | 2023 |
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| DUCKTRAP 1875804 · TMA1073293 | Mowi Ducktrap, LLC | 29 Meat | Registered | 2020 |
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| DESTRESS 1691563 · TMA918699 | CANADIAN BIO-SYSTEMS INC. | 5 Pharmaceuticals | Registered | 2015 |
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| DOCTORINSOLE 1677937 · TMA941818 | Brandable Ventures, LLC | 10 Medical | Registered | 2016 |
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| DAZTRODE 1633769 · TMA1033225 | GLAXO GROUP LIMITED | 5 Pharmaceuticals | Registered | 2019 |
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| DOCTORSOFT 1523078 · TMA947762 | SSL DS, Inc. | 41 Education42 Science | Registered | 2016 |
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| DOSATRON 1155722 · TMA632843 · design | DOSATRON INTERNATIONAL Une société anonyme | 9 Electronics37 Construction42 Science | Registered | 2005 |
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| DUSTREAT 0867369 · TMA502638 | BL Technologies, Inc. | 1 Chemicals | Registered | 1998 |
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| DOSATRON 0727245 · TMA432430 | DOSATRON INTERNATIONAL Une société anonyme | 9 Electronics | Registered | 1994 |
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| DOGGYTREND 2317858 | Doggytrend Inc | 18 Leather35 Advertising | Pending | 2024 |
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