# Relationship history for MSHA mine 4603392

Current hierarchy: **Sharon  Preece → Ray Todd Coal Company Inc → Ferguson 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:** Occidental Petroleum Corp → Ferguson No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ferguson Coal Corp → Ferguson No 1 Mine; 1950-01-01 to 1981-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Ferguson James H → Ferguson No 1 Mine; 1950-01-01 to 1981-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Ferguson James H → Ferguson Coal Corp; 1950-01-01 to 1981-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Rapp Cecil H Jr → Ferguson No 1 Mine; 1978-07-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ferguson Coal Corp → Ferguson No 1 Mine; 1981-06-30 to 1986-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Rapp Cecil H Jr → Ferguson Coal Corp; 1981-06-30 to 1986-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Ellis Charlie R → Ferguson No 1 Mine; 1984-04-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dale & Tina Coal Company Inc → Ferguson No 1 Mine; 1986-06-09 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Ellis Charlie R → Dale & Tina Coal Company Inc; 1986-06-09 to 1987-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Island Creek Coal Company → Ferguson No 1 Mine; 1987-05-01 to 1990-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1987-05-01 to 1990-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Ray Todd Coal Company Inc → Ferguson No 1 Mine; 1990-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sharon  Preece et al → Ferguson No 1 Mine; 1990-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  Preece et al → Ray Todd Coal Company Inc; 1990-07-27 to current/open; source msha-controller-operator-history