carrier frequency repeater equipment
audio frequency and video frequency processing
correlation in frequency domain and frequency domain
High frequency and low frequency
Low Frequency and Acoustic Frequency
Low Frequency and Medium Frequency Therapy Equipment
theoretical frequency and actual frequency
114 telephone navigation
114 telephone number inquiry
3G mobile video telephone
a telephone hot-line has been set up
above Shell of Telephone
aerial for radio telephone
Analogue speech telephone card
analogue telephone phoneme card
antisidetone telephone set
automatic dial-up two-way telephone
automatic telephone room