| # | Letters of Interpretation |
|---|---|
| 1 | - 1910 Subpart O - Lockout/tagout requirements for servicing manually-controlled vertical/horizontal milling machine and drill press tool changes. |
| 2 | - 1910 Subpart O - Standards applicable to an automatic transfer device for processing and moving product. |
| 3 | - 1910 Subpart O - Machine guarding for drilling operations. |