Honestly, R&D is everything. It’s Researching & Developing new technology. An ‘r&d worker’ could be one of the technicians working on the lasers, or another working in metallurgy to find new or better materials to cut at the tiniest of scales, a third team writing experimental code. It’s a big umbrella term, $10B in R&D is $300M here, $20M, there, $100,000 somewhere else.
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