# Relationship history for MSHA mine 2003352

Current hierarchy: **Alexander M  Osburn → Osburn Sand and Gravel → Osburn Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Richard  Jackson → Osburn Pit; 1998-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McConnell Sand & Gravel Inc → Osburn Pit; 2006-04-04 to 2011-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Jackson → McConnell Sand & Gravel Inc; 2006-04-04 to 2011-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Osburn Sand and Gravel → Osburn Pit; 2011-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alexander M  Osburn → Osburn Pit; 2011-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alexander M  Osburn → Osburn Sand and Gravel; 2011-08-29 to current/open; source msha-controller-operator-history