Four - gas
- four concentric circle near-field template
- four concentric circle refractive index template
- four-digit
- four-terminal network
- four-valued
- fourfold
- Fourier density
- fraction
- fraction of the market
- fractionation
- fracture
- fragment
- frame
- Fraunhofer diffraction pattern
- free carbon
- free of charge
- free on board
- free on board price
- free on car
- free on rail
- free on rail price
- free on wagon
- free reel
- freezing test
- freight
- freight car
- freight handling
- freight insurance
- frequency
- frequency band
- frequency component
- frequency control
- frequency converter
- frequency discriminator
- frequency distortion
- frequency drift
- frequency fluctuation
- frequency instability
- frequency of sampling
- frequency offset
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