Keywords: aircraft vehicle rotor blade airplane outdoor Title: HTK-1 - first twin turbine helicopter, 1954 NHHS Photo Subject: HTK-1 - first twin turbine helicopter, 1954 NHHS #: 1999.008.024 Catalog #: 13_000239 Type: NHHS Photo Format: BW Glossy Photo Location: NHHS Collection Box 1 Repository : San Diego Air and Space Museum Archive Title: HTK-1 - first twin turbine helicopter, 1954 NHHS Photo Subject: HTK-1 - first twin turbine helicopter, 1954 NHHS #: 1999.008.024 Catalog #: 13_000239 Type: NHHS Photo Format: BW Glossy Photo Location: NHHS Collection Box 1 Repository : San Diego Air and Space Museum Archive |