It is not there. I even searched to find who did design the C-15. I found no credited designer.
I don't know where the belief came from but my ID department had a pipeline into Henry Dreyfuss and Associates right until I graduated. I had a lot of close contact and maybe that is where I learned this fact. It's also possible that 3M has an internal design department therefore no credit is given. I have to point out that is just like 3M to dispose of mining waste a little at time in the form of tape dispensers. That is some real vertical integration.
Finally I'm surprised that the you believe the HDA is incapable of designing forms such as the C-15. They designed the "Princess"" phone and the round Honeywell thermostat.
3M was featured in "Search of Excellence" I think focusing on the the post-it note invention. They wanted a super strong glue and instead got a mild glue and turned it into the post-it note.
I will see what they say about the internal design department.
