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| Number | Title | Issue Date |
| 4918799 | Method and apparatus for forming stringers for free-standing circular staircases A structure on which stringers for a free-standing circular staircase are formed in accordance with a time-saving method is disclosed. The structure comprises upper and lower metal patterns connected by vertical beams. The patterns have a plurality of ray... | 04/24/1990 |
| 4688612 | Machine for cutting and finishing curved wooden members with cut-off and routing attachments A machine for precision cutting and finishing of curved wooden members, includes a generally vertically disposed column; a support assembly including a plurality of spaced, relatively narrow support guides; a radially adjustable clamping assembly on each ... | 08/25/1987 |
