Workers manufacturing and assembling Clipper seaplane in Boeing factory in US

Workers working on nose of airplane / VS workers assembling frame of wings / workers working on nose / workers assembling motors /VS fuselage with tail on dock outside and wing being moved into position / pan across fuselage with tail on dock / workers working on nose / shot of plane on wheeled carrier on dock from inside factory / plane on carrier in doorway of factory / VS two workers cranking winch to pull plane by ropes out of factory onto dock / men working on carrier underneath plane / plane on carrier on dock / wider shot of plane on carrier on dock / four shots of wing on carrier being pulled by truck with ropes out of factory / Note: exact month/day not known; documentation incomplete