229916 ⎘
Details of colour television systems; Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position
Methods and apparatus to count people
#2Methods and apparatus to count people
#3Methods and apparatus to count people
#4Method and apparatus to count people
#5Methods and apparatus to count people
#6Cathode ray tube of the index type
#7Index tube with tracking structures