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| Number | Title | Issue Date |
| 5172517 | Plant tube for use in flower pots A special production pot includes a upstanding portion and a conical center depression for accepting lower pointed end of a plant tube. The bottom edge of the plant tube is elevated well above the top of the upstanding pot portion of the special productio... | 12/22/1992 |
| 5031356 | Plant tube for use in flower pots A plant tube (6) for insertion into a plant pot (2) in a substantially upright position. The plant tube (6) includes an at least partly open, non-narrowing lower end (12), with at least one planar thin walled protrusion (20) provided at the lower end (12)... | 07/16/1991 |
