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| Number | Title | Issue Date |
| 7415859 | Method and apparatus for forming blind holes in sheet material A method of forming blind holes in a sheet material is provided. The method includes forming a recessed segment in the sheet material, stamping the recessed segment between a tapered punch and a pad to form a blind hole having a sealed end and a sidewall, wherein th... | 08/26/2008 |
| 7370505 | Method of forming blind holes in a sheet of material A method of forming blind holes in a sheet material is provided. The method includes punching the sheet material to define a hollow projection through the material and shearing a layer of material from the sheet material to form a sealed end over an opening of the h... | 05/13/2008 |
