# Relationship history for MSHA mine 4607696

Current hierarchy: **Cortis W  Bailey → W & J Mining Inc → 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

- **operator_operates_mine:** Quality Energy Inc → No 1 Mine; 1989-04-01 to 1994-01-31; source msha-controller-operator-history
- **controller_controls_mine:** K Dale  Tolliver et al → No 1 Mine; 1989-04-01 to 1994-01-31; source msha-controller-operator-history
- **controller_controls_operator:** K Dale  Tolliver et al → Quality Energy Inc; 1989-04-01 to 1994-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Quality Energy Inc → No 1 Mine; 1994-02-01 to 2001-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Howard Russell  Morris → No 1 Mine; 1994-02-01 to 2001-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Howard Russell  Morris → Quality Energy Inc; 1994-02-01 to 2001-04-05; source msha-controller-operator-history
- **operator_operates_mine:** W & J Mining Inc → No 1 Mine; 2001-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cortis W  Bailey → No 1 Mine; 2001-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cortis W  Bailey → W & J Mining Inc; 2001-04-06 to current/open; source msha-controller-operator-history