The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

Production Research CORP. Cummings & Sander

Named as the FAA publishes it on its approvals.

Approved to make 9 classes of equipment. FAA spelling: Production Research Corp. Cummings & Sander.

Equipment approvals technical standard order authorisations

1990-01-01TSO-C5 · Direction Instrument, Nonmagnetic, Gyro-Stabilized Type (Directional Gyro) · *, *, * · instruments and avionics
1990-01-01TSO-C4C · BANK AND PITCH INSTRUMENTS · *, *, * · other and general
1990-01-01TSO-C2 · Airspeed Instruments · *, *, * · instruments and avionics
1990-01-01TSO-C5C · Direction Instrument, Nonmagnetic, Gyro-Stabilized Type (Directional Gyro) · *, *, * · instruments and avionics
1990-01-01TSO-C3 · Turn and Slip Instrument · *, *, * · instruments and avionics
1990-01-01TSO-C4 · Bank and Pitch Instruments · *, *, * · other and general
TSO-C22E · Safety Belts · *, *, * · other and general
TSO-C45 · Manifold Pressure Indicating Instruments · *, * · other and general
TSO-C47 · Pressure Instruments - Fuel, Oil, And Hydraulic · *, *, * · heating, ice protection and utility systems

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.