# Relationship history for MSHA mine 2002976

Current hierarchy: **Mark  Constine → Constine Gravel Co. → Oakley 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

- **operator_operates_mine:** Constine Inc → Oakley Pit; 1996-04-01 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Rod  Constine  et al → Oakley Pit; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rod  Constine  et al → Constine Inc; 1996-04-01 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Constine  et al → Constine Inc; 1996-04-01 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Constine  et al → Constine Inc; 1996-04-01 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Constine → Oakley Pit; 2009-08-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Constine Gravel Co. → Oakley Pit; 2015-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Constine → Constine Gravel Co.; 2015-06-16 to current/open; source msha-controller-operator-history