# Relationship history for MSHA mine 4601484

Current hierarchy: **Borgman Lawrence W → Pioneer Coal Sales Inc → Borgman #10**

- 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:** Borgman Coal Company → Borgman #10; 1950-01-01 to 1981-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Borgman Howard C Et Al → Borgman #10; 1950-01-01 to 1981-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Borgman Howard C Et Al → Borgman Coal Company; 1950-01-01 to 1981-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Coal Sales Inc → Borgman #10; 1981-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Borgman Lawrence W → Borgman #10; 1981-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Borgman Lawrence W → Pioneer Coal Sales Inc; 1981-11-16 to current/open; source msha-controller-operator-history