Hierarchy classification:

1. top of the aat hierarchies
2. Brand Names Facet
3. Brand Names (hierarchy name)
4. brand name objects

Anotations

Scope note:

Proprietary name for an analog videocassette format developed by Sony in 1969, using 3/4" tape with a running speed of 3.75 inches per second. The format was popular in semi-professional industrial, educational and broadcast contexts from the 1970s until the advent of digital video technology.