resources.whatwg.org/browser-logos
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android.svg
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From http://en.wikipedia.org/wiki/File:Android_robot.svg
This file is licensed under the Creative Commons Attribution 3.0 Unported license. http://creativecommons.org/licenses/by/3.0/deed.en
The Android robot is reproduced or modified from work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License.

bb.jpg
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From http://us.blackberry.com/legal/trademarks/blackberry-branding-guidelines.html#/h:/legal/trademarks/rim-logo-list.html
See http://us.blackberry.com/legal/trademarks/blackberry-branding-guidelines.html#/h:/legal/trademarks/logos-and-imagery.html

Other logos
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From https://github.com/alrra/browser-logos
See https://github.com/alrra/browser-logos#legal