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

Northrop Corporation

Named as the FAA publishes it on its approvals.

Holds 4 approved modifications, most of them for the Bell 47. FAA spelling: Northrop Corporation.

Approved modifications 4 · newest first

Bell 47 2
1960-01-01SA308WE · Voice interruption priority system. · 22 Series
1960-01-01SA357WE · Goodrich brake assembly 2-878 and wheel assembly 3-1112. · P.166
1960-01-01SH4-619 · Exhaust muffler. · 47 Series, 47 Series, 47 Series
1960-01-01SH4-1419 · Exhaust muffler. · 47 Series, 47 Series, 47 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.