
1) Discarded storage technology 2) Japanese invention 3) Loser to vhs
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https://www.crosswordclues.com/clue/betamax

(from the article `videocassette recorder`) ...of videocassette recorders were developed in the l960s, but the first relatively convenient and low-cost VCR was introduced by the Sony ... ...he invested in winning products were sometimes invested in missteps as well. For instance, Sony was one of the first to release videocassette ... ...
Found on
http://www.britannica.com/eb/a-z/b/57

Domestic videotape system introduced by Sony in 1975. Despite numerous advantages over its main rival VHS (a three-year head start, better picture quality, more compact tape cassettes), it rapidly lost ground thanks to Sony's decision not to licence the technology to other manufacturers - which its then chairman Akio Morita later admitted was his s...
Found on
http://www.screenonline.org.uk/education/glossary.html

A now obsolete home video system.
Found on
http://www.transedit.se/glossary.htm

(Trade Name) Consumer-level analog videocassette magnetic tape recording format developed by Sony, released on May 10, 1975
Found on
https://www.theatrecrafts.com/
No exact match found.