The scene
A name that sounds made for a high-voltage laboratory began with textiles. In its 1986 anniversary notice, the Swiss electrotechnical bulletin explains TETTEX as “Technische Artikel und Textilien” — technical articles and textiles. Paul and Martha Müller founded the business soon after the Second World War, and for years a textile-trading operation stood beside the developing electrical-measurement workshop. The unlikely pairing gives the firm a more human beginning than any product list.
The engineering challenge
The workshop gradually specialised in precision. Its early catalogue included Wheatstone and Thomson resistance bridges; the 1986 account dates a high-voltage Schering bridge to 1950, an internally designed type 2801 to 1955, and a fully automatic capacitance and loss-factor measuring installation to 1963. A later HAEFELY timeline associates the 2801 with 1963. These are source-specific milestones, not proof that a single instrument was first launched twice: design, production and later system integration must not be conflated.
Why it matters
People connect those milestones. The anniversary account names both founders and describes later automatic instruments under technical director Dr. P. Osvath; a separate patent record also identifies Peter Osvath as an inventor. TETTEX subsequently joined the HAEFELY family in the mid-1990s, but its legacy cannot be reduced to a change of ownership: patient improvements in measurement outlasted both the original textile sideline and successive product names.
Sources, scope and limits.
Primary contemporary report: “40 Jahre Tettex AG, Zürich”, Bulletin SEV/VSE 77 (1986) 15, p. 976, viewed in archival OCR (mixed columns); patent and later corporate history distinguished. The user-supplied 1986 PDF is an annual index, not the article facsimile.
- 40 Jahre Tettex AG, Zuerich, SEV/VSE 77 (1986) 15, 9 Aug 1986, p. 976S-167 · contemporary_reporting · 1986 full historical text retrieved via web PDF parser; PDF screenshot redirected to bot challenge, visual verification pending
- Haefely TETTEX product overview historical instrument and PD portfolioS-174 · corporate_publication · web_text_inspected; check originals for all visual media
- DE3329726C1 TETTEX capacity and loss-factor measuring bridge patent, priority 1983S-169 · patent_register · web_text_inspected; check originals for all visual media
- HAEFELY IDAS2823/REF official brochure original visual tan-delta timelineS-F2-017 · corporate_publication · original_pdf_text_and_page2_visual
New documentary references
- SEV/VSE Bulletin 77 (1986), annual index: TETTEX AG, Zürich, page 976Uploaded 1986 volume index confirms the TETTEX entry on page 976; it is NOT the original article. Full facsimile of the anniversary article remains to be checked.
Visual quotations document individual historical points with named sources and creators; they are not a general image-library licence. Equipment claims are intentionally narrower than the surrounding institution’s activities.