Tob. Reporter, 1980, 107-1, p. 50, ISSN.0361-5693
Measuring smoke dilution in a vented-filter
U.S. Patent 4,171,635, assigned to Liggett Group Inc. As a puff generator draws a volume of smoke and air through the vented filter cigarette, air is drawn from a ventilation cylinder, causing a piston to travel to a dead center position. The amount...