Opening lever for magnetic tape cartridge door

Operating mode change-over apparatus in tape recording...

Operation changing mechanism for loading a tape cassette...

Optic storage medium

Optical apparatus for writing and/or reading recording...

Optical article having a thermally responsive material as an...

Optical article having anti-theft feature and a system and...

Optical article having anti-theft feature and a system and...

Optical card

Optical card

Optical card and a recording/reproduction apparatus for the...

Optical card and manufacturing method thereof

Optical card having light-absorbing layer

Optical card of closed type

Optical card, a card holder and an apparatus for recording,...

Optical compact disc storage and loading cassette

Optical data carrier with a thermochromic layer

Optical data recording method, and data recording medium

Optical data recording/reproducing apparatus

Optical data retrieval system for multi- characteristic...