# Relationship history for MSHA mine 1515655

Current hierarchy: **George E  Barker → New Horizons Coal Inc → Oxford #9**

- 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:** Simpson-Whitfield Coal Company Inc → Oxford #9; 1986-06-01 to 1992-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Whitfield Bill → Oxford #9; 1986-06-01 to 1992-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Whitfield Bill → Simpson-Whitfield Coal Company Inc; 1986-06-01 to 1992-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → Oxford #9; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Toby & Teddy Et Al → Oxford #9; 1991-05-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Four-B Inc → Oxford #9; 1992-11-15 to 1993-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Toby & Teddy Et Al → Four-B Inc; 1992-11-15 to 1993-05-19; source msha-controller-operator-history
- **operator_operates_mine:** New Horizons Coal Inc → Oxford #9; 1993-05-20 to 1994-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → New Horizons Coal Inc; 1993-05-20 to 1994-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Capps David Et Al → Oxford #9; 1994-04-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W G S Coal Inc → Oxford #9; 1994-10-21 to 1995-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Capps David Et Al → W G S Coal Inc; 1994-10-21 to 1995-10-24; source msha-controller-operator-history
- **controller_controls_mine:** George E  Barker → Oxford #9; 1995-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Horizons Coal Inc → Oxford #9; 1995-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George E  Barker → New Horizons Coal Inc; 1995-10-25 to current/open; source msha-controller-operator-history