Apparatus for measuring the characteristics of a wideband electr
Apparatus for monitoring a reading position for use in a disc pl
Apparatus for monitoring a wideband electromechanical recording
Apparatus for monitoring optical path differences utilizing an e
Apparatus for mounting and rotating an optical card for recordin
Apparatus for moving a carriage assembly from an initial positio
Apparatus for moving a tone arm
Apparatus for moving an optical system
Apparatus for optical disc memory with correction pattern and ma
Apparatus for optical disc storage of optical discs and selectiv
Apparatus for optical pick-up
Apparatus for optically reading a disc-shaped record carrier, in
Apparatus for optically reading a record carrier with two types
Apparatus for optically reading and/or recording information
Apparatus for optically reading information from a record carrie
Apparatus for optically recording and reproducing information
Apparatus for optically recording and reproducing information fr
Apparatus for optically recording and reproducing information in
Apparatus for optically recording data into a disc
Apparatus for optically recording information on opto-magnetic r