Sources

Every source backing a fact on PictureTel Corporation's own page, deduplicated — the same source backing several facts appears once.

• https://github.com/sven-mayer/chi-statistics — https://github.com/sven-mayer/chi-statistics
• https://www.wikidata.org/wiki/Q7191141 — https://www.wikidata.org/wiki/Q7191141