First automatic pneumatic rock drill used at Hoosac Tunnel
| Title: | First automatic pneumatic rock drill used at Hoosac Tunnel |
| URI: | http://hdl.handle.net/2452/48671 |
| Date: | 1865 |
Files in this item
| Files | Size | Format | View |
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| ocn496810886.jpg | 17.74Mb | JPEG image |
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