# Relationship history for MSHA mine 1100629

Current hierarchy: **United Energies Inc → Harrisburg Coal Company → Mine No 1**

- 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:** Harrisburg Coal Co Inc → Mine No 1; 1950-01-01 to 1975-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Harrisburg Coal Co Inc → Mine No 1; 1950-01-01 to 1975-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Harrisburg Coal Co Inc → Harrisburg Coal Co Inc; 1950-01-01 to 1975-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Harrisburg Coal Co Inc → Mine No 1; 1975-07-21 to 1976-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Buddie R  Morris → Mine No 1; 1975-07-21 to 1976-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Buddie R  Morris → Harrisburg Coal Co Inc; 1975-07-21 to 1976-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Harrisburg Coal Company → Mine No 1; 1976-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** United Energies Inc → Mine No 1; 1976-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United Energies Inc → Harrisburg Coal Company; 1976-11-15 to current/open; source msha-controller-operator-history