310->310 no change :) Inboard, "plasticky" entry level saw.
352-> gets a 3510 which replaces it ant 370. Lighter saw (lightest of it's kind), +15% of power, -8% of weight.
370-> 3510 changed to outboard. Lighter saw (lightest of it's kind), +9% of power, -24% of weight.
400/420-> 4010 was...