D. He

The study and design of pneumatic wheel-type seed-metering device.

C. G. Ma, S. Z. Wang, S. Q. Zhang, 1990 .

Frequency dependence in RF discharge excited waveguide CO 2 lasers

D. He, D. Hall, D. He, 1984 .

Longitudinal voltage distribution in transverse rf discharge waveguide lasers

D. R. Hall, D. He, 1983 .

High efficiency RF excited CO2 laser

D. R. Hall, D. He, D. Hall, 1985 .