This originally sprang out of this Meta question, and then a quick discussion in chat. This question is designed to test the underlying assumption behind the Meta question.
It seems to some that open hardware is developing slower than open software is, though there are a non-negligible amount of projects. Going back in time, however, the rates might be different.
Does open hardware attract contributors in similar speed as open source software early on did? By "early on", I mean the 1980s, give or take.