21 Anonymous In: Question-Answer Before selling office supplies, 3M was in what industry? 21 Question: Before selling office supplies, 3M was in what industry? Microscopy Motion pictures Museums Mining 0 Answers Voted Oldest Recent Random Best Answer Goto 2021-05-01T03:02:47+00:00Added an answer on May 1, 2021 at 3:02 am The correct answer is Mining. 15 Reply Share Share Share on Facebook Share on Twitter Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment.