clock ray

cathode ray tube (CRT)

X - X-ray – XRAY

X-ray radiation

X-ray inspection

cosmic ray albedo

X-ray flаw detection

X-ray testing

ray

X-ray photon

gamma-ray photon

sound ray

clock delay mechanism

slave clock

around-the-clock fire support

clock code

clock course

clock-course angle

user clock time bias error

round the clock operation aerodrome

around-the-clock fire support capability

clock driver

effectiveness clock

clock basher

clock face method

clock method

clock train

clock type of fuze

target-airplane-battery clock

six o'clock aiming point

six- o'clock holding