# Relationship history for MSHA mine 4500256

Current hierarchy: **Mutual Materials Company → Mutual Materials Company → Elk 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:** Mutual Materials Company → Elk Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Moulden & Sons' Inc → Elk Pit; 1950-01-01 to 1989-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Moulden Ronald F → Elk Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moulden Ronald F → Moulden & Sons' Inc; 1950-01-01 to 1989-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Stowe Construction Inc → Elk Pit; 1989-06-01 to 2003-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Stowe Linda & Bryan → Elk Pit; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stowe Linda & Bryan → Stowe Construction Inc; 1989-06-01 to 2003-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Mutual Materials Company → Elk Pit; 2003-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mutual Materials Company → Mutual Materials Company; 2003-03-31 to current/open; source msha-controller-operator-history