Datanetics DC-70 series
Datanetics DC-70 series is a currently undocumented switch product from Datanetics. According to Datanetics history, the design concept was initiated in 1977; it was to be "very low profile" The switch appears to have been in production in 1982, used in keyboards manufactured by TEC Incorporated, at which point TEC bought the product line. No further details are known.
Meryl Miller left Datanetics in November 1978, at which point DC-70 was not yet available. This suggests that US patent 4117438, filed in 1977, is not DC-70, but the patent could have been taken out before the product was in production (this project was reportedly "secret"). DC-70 appears to have been Mike Muller's project, which makes ITT discrete snap-action and ITT snap-action array candidates.
Arizona Republic article
The following is an incomplete transcript of the inaccurate OCR version of the Arizona Republic newspaper article from 22nd of January 1982:
TEC Inc. buys keyboard line
… know-how, as well as the equipment and tooling required for immediate production. TEC is producing the DC 70 keyboards for Datanetics' customers. It manufactures video-display terminals for the computer-peripheral market and electronic components for the computer and process-control industries, as well as performing subcontract-assembly work for large corporations. TUCSON TEC Inc. announced Thursday that it has purchased a line of DC 70 keyboards from Datanetics Corp., an International Telephone and Telegraph Corp. subsidiary in Fountain Valley, -Calif. The dollar amount of the sale was not disclosed. TEC is producing the line of mechanical-switch keyboards at its Tucson plant. The keyboard is aimed at manufacturers of home-computing equipment, terminals and small-business systems. The agreement calls for sale of the related engineering and manufacturing data and …
- Correspondence with Meryl Miller, former employee
- Newspapers.com — Arizona Republic from Phoenix, Arizona · Page 28 (1982-01-22)