Siemens
Named as the FAA publishes it on its approvals.
Approved to make 2 classes of equipment. FAA spelling: Siemens.
Equipment approvals technical standard order authorisations
2007-03-09TSO-C1d · Cargo Compartment Fire Detection Instruments · Optical Smoke Detectors, Optical Smoke Detectors, Optical Smoke Detector · emergency equipment
2004-08-24TSO-C1c · CARGO COMPARTMENT FIRE DETECTION INSTRUMENTS · * · other and general
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.