# Relationship history for MSHA mine 0801175

Current hierarchy: **Page James M → Page Materials Inc → Oak Hill Shell 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Burch & Son Company → Oak Hill Shell Pit; 1991-08-01 to 1994-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Burch R Kenneth → Oak Hill Shell Pit; 1991-08-01 to 1994-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Burch R Kenneth → Burch & Son Company; 1991-08-01 to 1994-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Page Materials Inc → Oak Hill Shell Pit; 1994-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Page James M → Oak Hill Shell Pit; 1994-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Page James M → Page Materials Inc; 1994-03-22 to current/open; source msha-controller-operator-history