Applying for trademark is an important business, legal, and strategic decision. Therefore, you should be absolutely sure.
Trademarks can be filed with or without a logo. If you just file an application to protect the words, that is what you have protected. Therefore, after you are sure on the logo you want to use, you will need another application.
If you file a trademark with your logo, you cannot change it afterwards. A new application must be filed.
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