Top Cover， Bottom Cover， And Cover Board

cover-to-cover translation

from cover to cover

with average cover {= WA Cover}

2K-H form planetary transmission

2K-H planetary

2Z-X D planetary mechanism

3-roll planetary mill

acceleration of planetary notion

Association of Lunar and Planetary Observers

Atmospheric Planetary Boundary Layer Model

axle planetary gear

axle planetary ring gear

bipolar planetary nebula

brake and planetary group

Carrier-planetary

Closed planetary gear

Closed Planetary Gear Train

Closed planetary transmission