-
公开(公告)号：US3595137A
公开(公告)日：1971-07-27
申请号：US3595137D
申请日：1968-08-09
CPC分类号： A24D3/0225
摘要： The manufacture of cigarette filters containing a particulate filtering material in a compartment in which beads of polystyrene are expanded within the compartment to take up excess space in it and prevent smoke bypassing the filtering material.
搜索结果
1 条记录 (耗时 0.009 秒)
筛选
AND
AND
过滤
NOT
NOT
扫码加群
