Dual actions of Meis1 inhibit erythroid progenitor development and sustain general hematopoietic cell proliferation. (nature.com)
Ultra light aluminium chassis, with dual action brakes, front and rear suspension and Pro-Fix system to attach the seat in the forward or rearward facing position and with the possibility of attaching all the Jané accessories. (jane-uk.com)
I use meguirs diamond cut 2, then using meguirs dual action polisher to get it pretty smooth. (mechanics.stackexchange.com)