parallel plain crystal gauge
temperature-compensated crystal reference oscillator(TCXO)
ae[o]lotropic crystal; crystal anisotropic; anisotropic crystal
crystal-controlled oscillator(=crystal oscillator)
cubic crystal and 3m crystal
mix-crystal(mixed crystal)
single crystal nickel crystal superalloy
inertial [reference] frame， inertial [reference] system
optical reference filter wavelength standard reference material
Bayard-Alpert ionization gauge (B-A gauge)
Brown and Sharpe wire gauge {= B&S wire gauge}
track gauge level gauge
(111) dominating crystal surface