# Relationship history for MSHA mine 4603154

Current hierarchy: **Harrold Don → Joyce Properties Inc → Joyce No 1 Tipple**

- 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:** Reppert Fuels Inc → Joyce No 1 Tipple; 1950-01-01 to 1973-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Reppert Fuels Inc → Joyce No 1 Tipple; 1950-01-01 to 1973-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Reppert Fuels Inc → Reppert Fuels Inc; 1950-01-01 to 1973-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Harrold Don → Joyce No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Joyce Properties Inc → Joyce No 1 Tipple; 1973-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harrold Don → Joyce Properties Inc; 1973-04-03 to current/open; source msha-controller-operator-history