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

Navigation Devices, INC

Named as the FAA publishes it on its approvals.

Holds 2 approved modifications, most of them for the Piper PA-22 Tri-Pacer and Colt. FAA spelling: Navigation Devices, Inc.

Approved modifications 2 · newest first

SA1-316 · Dart I-M turn control unit. · 170 Series
SA1-255 · Dart I-M turn control unit. · PA-22 Series

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.