The time for applying the current to the electrical heating wires 2 to split the cathode ray tube 6 is not particularly limited, but may be {HEAD ~ several tens} of seconds to {TAIL ~ several minutes} 
to
The time for applying the current to the electrical heating wires 2 to split the cathode ray tube 6 is not particularly limited , but may be { HEAD ~ several tens } of seconds to { TAIL ~ several minutes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL