Executive Technical Services
Named as the FAA publishes it on its approvals.
Approved to make 2 classes of equipment. FAA spelling: Executive Technical Services.
Equipment approvals technical standard order authorisations
2019-04-26TSO-C55 · Fuel And Oil Quantity Instruments (Reciprocating Engine Aircraft) · Fuel Quantity Indicator, Fuel Quantity Indicator · engine
2019-04-26TSO-C7D · Direction Instrument, Magnetic Non-Stabilized Type (Magnetic Compass) · Compass, Magnetic · instruments and avionics
Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, parts manufacturer approvals, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.