(+)Frequency correction
(+)Frequency-offset locked loop
(light-)frequency modulation
(Ultra) high frequency time series
~(87)Rb atomic frequency standard
10 kV frequency converter
2 GHz microwave frequency-changing
2-D optical frequency-time coding
3060 day low-frequency oscillation
3D frequency domain potential theory
4D time-frequency volume
4-level frequency modulation (4-level FM)
50hz Frequency Interference
50Hz power frequency interference
95% spetral edge frequency
A C frequency modulator speed govornor
A Frequency Distribution Table
a high frequency and efficiency regeneration syste