Large amounts of dust collected on the astronauts' space suits during excursions to the lunar surface. The dust, if depositied in the Lunar Module threatened to contaminate the cabins environmental control sytem. Following the Apollo 12 mission, astronaut Alan Bean noted that they had lacked a means to remove the dust from their suits prior to enentering the Lunar Module. Subsequent missions were equipped with these large brushes, which were used prior to LM cabin ingress.
This brush was used during training and was transferred from NASA to the Museum in 1974.