| # | Letters of Interpretation |
|---|---|
| 1 | - 1926.900 - Packing materials which were used for packaging explosives must be burned. |
| 2 | - 1926.900 - Blasting operations within completely contained vessel and sunup/sun own requirements. |
| 3 | - 1926.900 - Seismic explorations as it pertains to detonation. |
| 4 | - 1926.900 - Electric blasting machine. |
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