Note, the rankings are:
> as a percentage of its revenue.
Also, regarding 3M, I am not sure what you mean by 'far lower margin industry'. 3M is a conglomerate. It's like GE, in some sense- doesn't play in any single industry, but in several tens of industries.
I think that ranking cannot be by %age R&D spend. Taking the R&D expenditure from your link, and turnover from the accounts for 2012, we have (money values in $bn):
Also, regarding 3M, I am not sure what you mean by 'far lower margin industry'. 3M is a conglomerate. It's like GE, in some sense- doesn't play in any single industry, but in several tens of industries.