# Relationship history for MSHA mine 1515285

Current hierarchy: **Les  Mayhorn; Kennith  Layne → Four Way 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:** J E & K Enterprises → No 1; 1985-07-01 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Daugherty Ervin → No 1; 1985-07-01 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty Ervin → J E & K Enterprises; 1985-07-01 to 1986-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Four Way Coal Company Inc → No 1; 1986-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Les  Mayhorn et al → No 1; 1986-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Les  Mayhorn et al → Four Way Coal Company Inc; 1986-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kennith  Layne et al → Four Way Coal Company Inc; 1986-02-18 to current/open; source msha-controller-operator-history