"Piasecki SH-21 Workhorse" . . "1952" . "H-21C" . . "HH-21" . . . "Piasecki H-21 Shawnee" . "Piasecki H-21" . "Vertol H-21" . . . . "H-21 Workhorse" . . "Boeing Vertol/Piasecki H-21" . . . . . . . "Piasecki CH-21C Shawnee's" . . . "Vertol 44" . . . "Piasecki H-42A and H-44" . "H-21 helicopters" . . "CH-21 helicopter" . "Piasecki H-21A" . . "CH-21" . "Piasecki H-21 Workhorse" . . "Piasecki CH/SH/HH-21" . "Piasecki CH-21 helicopter" . . "Piasecki PV-22" . . . "Vertol Model 44A" . "Piasecki H-21C Shawnee" . . . . . . . "Vertol Canada CH-127/Piasecki H-44" . . . . . "Vertol V-43 / H-21 C" . . "H-21 Shawnee" . "YH-21-PH" . . . "Piasecki HRP-1" . . "1959" . "Piasecki CH-21 \\\"Flying Banana\\\"" . "H-21B" . . "Piasecki CH-21C Shawnee" . . . "Piasecki H-21C" . "CH-21C Shawnee" . . "Piasecki H-21/Ventrol V44A" . "CH-21 Shawnees" . . "Piasecki H-21 (U.S. Army CH-21 Shawnee)" . . "Piasecki H-27" . "H-21C Shawnee" . "HU-21 Workhorse/Shawnee" . . . . . . "Piasecki H-21 Work Horse" . . . . . . . . "Hkp 1" . . "Vertol H-21 helicopters" . . . . . "H-21 Workhorse/Shawnee" . . . . . . "Vertol Model H-21B" . "Piasecki CH-21C Workhorse" . . . . "Vertol CH-21B Workhorse" . "H-21" . . . "Piasecki CH-21" . "Piasecki Model 44" . . . "H-21/H-44" . . . "Piasecki CH-21B Workhorse" . . . . "Piasecki H-21B Shawnee" . "CH-21C" . "Piasecki H-21" . "CH-21 Shawnee" . "Piasecki H-21, CH-21, and HH-21 Workhorse" . . . "Piasecki H-25" . "CH/SH/HH-21" . . . "Shawnee" . . . .