| 2785681 | Filter | |||
| 2669995 | Disposable filter and holder | |||
| 2400176 | Catalytic conversion | |||
| 2192569 | Magnetic cigarette and support therefor | |||
| 2185293 | Cigarette and process of treating same | |||
| 2049320 | Cigarette | |||
| 2003690 | Tobacco product | |||
| 1972718 | Treatment of tobacco |
| GB187400476A | ||||
| GB191219694A | ||||
| GB421236A | ||||
| IT449559B | ||||
| GB528190A | ||||
| FR626721A |