sentences:  The Brazilian sculptor Maria Martins, Duchamp's girlfriend from 1946 to 1951, served as the model for the female figure in the piece, and his second wife, Alexina (Teeny), served as the model for the figure's arm.Duchamp prepared a "Manual of Instructions" in a 4-ring binder explaining and illustrating how to assemble and disassemble the piece.Anne d'Harnoncourt, a young curator at the Philadelphia Museum of Art and later its director, orchestrated the acquisition and transfer of the piece to Philadelphia.