# Relationship history for MSHA mine 0504020

Current hierarchy: **Rother Herman → Herman Rother → Rother Gravel 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:** Kiowa County → Rother Gravel Pit; 1985-04-01 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Kiowa County-Co → Rother Gravel Pit; 1985-04-01 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Kiowa County-Co → Kiowa County; 1985-04-01 to 1986-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Herman Rother → Rother Gravel Pit; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rother Herman → Rother Gravel Pit; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rother Herman → Herman Rother; 1986-02-13 to current/open; source msha-controller-operator-history