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

West Coast Propeller CO

Holds 3 approved modifications, most of them for the Boeing 75. FAA spelling: West Coast Propeller Co.

Approved modifications 3 · newest first

Boeing 75 1Spartan 7 1
1960-01-01SA4-1312 · Hartzell HA-B3Z30-1/10160-6 ground adjustable propeller (on aircraft with Pratt & Whitney R-985 Series engines only). · 75 Series
1960-01-01SA4-1408 · Hartzell HCB3Z30-1E/10152-5 1/2 propeller and C-3 governor. · 7W (Army UC-71)
1960-01-01SA4-1313 · Hartzell HA-B3Z30-1/10160-6 ground adjustable propeller on aircraft with Pratt & Whitney R985 series engines. · Navy N3N-3

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.