# Relationship history for MSHA mine 1502483

Current hierarchy: **Harris B W → Jason Coal Company Inc → Unit Mine**

- 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

- **controller_controls_mine:** Nick A  Cooley et al → Unit Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hunts Branch Coal Company Inc → Unit Mine; 1970-09-01 to 1980-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → Hunts Branch Coal Company Inc; 1970-09-01 to 1980-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Jason Coal Company Inc → Unit Mine; 1980-04-21 to 1981-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Hall Clemit → Unit Mine; 1980-04-21 to 1981-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Hall Clemit → Jason Coal Company Inc; 1980-04-21 to 1981-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Jason Coal Company Inc → Unit Mine; 1981-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harris B W → Unit Mine; 1981-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harris B W → Jason Coal Company Inc; 1981-02-13 to current/open; source msha-controller-operator-history