B
PERFORMING OPERATIONS; TRANSPORTING
B
PERFORMING OPERATIONS; TRANSPORTING
B64
AIRCRAFT; AVIATION; COSMONAUTICS
B64
AIRCRAFT; AVIATION; COSMONAUTICS
B64C
AEROPLANES; HELICOPTERS
B64C
AEROPLANES; HELICOPTERS
B64C33/00
Ornithopters
B64C33/00
Ornithopters
B64C33/02
Wings; Actuating mechanisms therefor
B64C33/02
Wings; Actuating mechanisms therefor
B64C33/025
the entire wing moving either up or down
B64C33/025
the entire wing moving either up or down