# Relationship history for MSHA mine 4603783

Current hierarchy: **Fields Mason & Larry Ratliff → Academy Coal Company Inc → 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:** Island Creek Coal Company → No 1; 1950-01-01 to 1980-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Occidental Petroleum Corp → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1950-01-01 to 1980-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Shannon Wells G-Ralph Et Al → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mills Edward → No 1; 1978-08-01 to 1982-06-03; source msha-controller-operator-history
- **operator_operates_mine:** F & J Coal Company Inc → No 1; 1980-08-28 to 1981-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Shannon Wells G-Ralph Et Al → F & J Coal Company Inc; 1980-08-28 to 1981-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Tree Coal Company Inc → No 1; 1981-05-29 to 1981-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Mills Edward → Sugar Tree Coal Company Inc; 1981-05-29 to 1981-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Breeden Elden H → No 1; 1981-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A C B Mining Inc → No 1; 1981-07-20 to 1985-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Breeden Elden H → A C B Mining Inc; 1981-07-20 to 1985-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Academy Coal Company Inc → No 1; 1985-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fields Mason & Larry Ratliff → No 1; 1985-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Mason & Larry Ratliff → Academy Coal Company Inc; 1985-04-11 to current/open; source msha-controller-operator-history