# Relationship history for MSHA mine 1512228

Current hierarchy: **Roger  Coleman → Big Fist Coal Company → No 1 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:** Thompson Benny → No 1 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Hackney Creek Coal Company → No 1 Mine; 1980-02-01 to 1980-03-09; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → No 1 Mine; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Little Hackney Creek Coal Company; 1980-02-01 to 1980-03-09; source msha-controller-operator-history
- **operator_operates_mine:** T & T Coal Company Inc → No 1 Mine; 1980-03-10 to 1980-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Benny → T & T Coal Company Inc; 1980-03-10 to 1980-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Coal Company → No 1 Mine; 1980-11-03 to 1981-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Smith Donald J → No 1 Mine; 1980-11-03 to 1981-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Smith Donald J → Medusa Coal Company; 1980-11-03 to 1981-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Big Fist Coal Company → No 1 Mine; 1981-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Coleman → No 1 Mine; 1981-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Coleman → Big Fist Coal Company; 1981-02-06 to current/open; source msha-controller-operator-history