B
PERFORMING OPERATIONS; TRANSPORTING
B
PERFORMING OPERATIONS; TRANSPORTING
B64
AIRCRAFT; AVIATION; COSMONAUTICS
B64
AIRCRAFT; AVIATION; COSMONAUTICS
B64C
AEROPLANES; HELICOPTERS
B64C
AEROPLANES; HELICOPTERS
B64C39/00
Aircraft not otherwise provided for
B64C39/00
Aircraft not otherwise provided for
B64C39/02
characterised by special use
B64C39/02
characterised by special use