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TitleDateType
1 Denver Rock Drill Co., Copy of Drill Sharpener Machine1923-01-31Image/StillImage
2 Denver Rock Drill Co.Copy of Drawing1924-05-13Image/StillImage
3 Denver Rock Drill Mfg. Co., Copy of Blue Print Section of Oil Furnace for Drill Sharpening Shop1924-06-14Image/StillImage
4 Denver Rock Drill Mfg. Co., Copy of Blue Print Section of Oil Furnace for Drill Sharpening Shop1924-06-14Image/StillImage
5 Denver Rock Drill Mfg. Co., Copy of Blue Print Section of Oil Furnace for Drill Sharpening Shop1924-06-14Image/StillImage
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