I (Ferric) at 200μs and Type IV (Metal) at 120μs. Competitors The microcassette was beaten to market by the mini-cassette, introduced by Philips in 1967. The mini-cassette is almost identical in appearance and dimensions to the microcassette, however it has thicker cogs for its reels and a slightly wider cassette. The mini-cassette, despite making it to market first, was less successful than the microcassette. A couple of products were created to compete with the microcassette. Dictaphone and JVC introduced the picocassette in 1985, which is half the size of the microcassette. In 1992, Sony released the NT memo recording system, which employs a small cassette for digital recording. See also inches per second and audio tape length and thickness for comparisons with other media. Mini-Cassette Picocassette NT (cassette) Notes External links and references Olympus History (includes reference to first microcassette recorder) Tech Flashback: The Microcasette – Part 1: The Tapes - Gough's Tech Zone Tech Flashback: The Microcasette – Part 2: The Recorders - Gough's Tech Zone Audiovisual introductions in 1969 Audio storage Tape recording 1969 in music 1969 in technology Products introduced in 1969