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Color codes for medical gases as adopted by the Bureau of Standards of the U.S. Department of Commerce
| 127142236 | Oxygen | Green | 0 | |
| 127142237 | Carbon Dioxide | Gray | 1 | |
| 127142238 | Nitrous Oxide | Blue | 2 | |
| 127142239 | Cylopropane | Orange | 3 | |
| 127142240 | Helium | Brown | 4 | |
| 127142241 | Ethylene | Red | 5 | |
| 127142242 | Carbon Dioxide-O2 | Gray/Green | 6 | |
| 127142243 | Helium-O2 | Brown/Green | 7 | |
| 127142244 | Nitrogen | Black | 8 | |
| 127142245 | Air | Yellow | 9 | |
| 127142246 | Nitrogen-O2 | Black/Green | 10 |
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