The Hoàng Cầm stove, named after its inventor, a Viet Minh soldier in 1951, was a stove intake and chimney system which diffused and dissipated smoke from cooking which prevented aerial detection of smoke by American military planes. They were used extensively in the Cu Chi tunnels and other hideouts. Another name for the cooker was the "guitar stove". The system required a deep, covered hole in the ground from which long underground bamboo vents dissipated the smoke.