File:Compressed air tunneling shield used for the Hoboken and Manhattan Railroad.png
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![File:Compressed air tunneling shield used for the Hoboken and Manhattan Railroad.png](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Compressed_air_tunneling_shield_used_for_the_Hoboken_and_Manhattan_Railroad.png/800px-Compressed_air_tunneling_shield_used_for_the_Hoboken_and_Manhattan_Railroad.png?20200229100750)
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Original file (1,297 × 673 pixels, file size: 1.1 MB, MIME type: image/png)