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

Young Isherwood & Marsh

Named as the FAA publishes it on its approvals.

Holds 1 approved modification, most of them for the Cessna 337 Skymaster. FAA spelling: Young Isherwood & Marsh.

Approved modifications 1 · newest first

Cessna 337 Skymaster 1
1961-01-01SA190SO · Cabin door removed and wind deflector installed. · 337A (USAF 02B)

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.