# Relationship history for MSHA mine 1505464

Current hierarchy: **Thompson Charlie Jr → Hurt & Thompson Coal Co Inc → No 3 Surface**

- 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:** Triple M Coal Corp → No 3 Surface; 1950-01-01 to 1974-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Monahan James T → No 3 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monahan James T → Triple M Coal Corp; 1950-01-01 to 1974-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Charlie Jr → No 3 Surface; 1974-08-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Makrich Mining & Leasing Co Inc → No 3 Surface; 1974-12-19 to 1975-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Coone Jerry → No 3 Surface; 1974-12-19 to 1975-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Coone Jerry → Makrich Mining & Leasing Co Inc; 1974-12-19 to 1975-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Hurt & Thompson Coal Co Inc → No 3 Surface; 1975-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Charlie Jr → Hurt & Thompson Coal Co Inc; 1975-06-13 to current/open; source msha-controller-operator-history