free electrical motional impedance
1G. W. Pierce — Infobox Scientist name = George Washington Pierce box width = caption = George Washington Pierce birth date =birth date|1872|1|11 birth place = Webberville, Texas death date = death date and age|1956|8|25|1872|1|11 death place = residence =… …
2Antenna (radio) — Whip antenna on car …
3Crystal oscillator — A miniature 4 MHz quartz crystal enclosed in a hermetically sealed HC 49/US package, used as the resonator in a crystal oscillator. A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal …
