# Relationship history for MSHA mine 1516146

Current hierarchy: **Mays Neil → Kevin Coal Inc → Kevin Buckhorn**

- 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:** Barry  Runyon et al → Kevin Buckhorn; 1985-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K-Jac Energy Inc → Kevin Buckhorn; 1987-08-01 to 1988-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Barry  Runyon et al → K-Jac Energy Inc; 1987-08-01 to 1988-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Brian A  Runyon et al → K-Jac Energy Inc; 1987-08-01 to 1988-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Mays Neil → Kevin Buckhorn; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Valley Coal Inc → Kevin Buckhorn; 1988-08-26 to 1989-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Bowling West → Kevin Buckhorn; 1988-08-26 to 1989-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Bowling West → Blue Valley Coal Inc; 1988-08-26 to 1989-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Kevin Coal Inc → Kevin Buckhorn; 1989-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mays Neil → Kevin Coal Inc; 1989-08-30 to current/open; source msha-controller-operator-history