Tob. Reporter, 1993, 118-1, p. 48-62, ISSN.0361-5693
Rate of fluid flow in ventilation zones
U.S. Patent 4,888,977. Assigned to Koerber AG, Hamburg, Germany. The degree of ventilation of ventilation zones in the wrappers of filter cigarettes is ascertained by confining the ventilation zones of successive cigarettes in a chamber during travel...