# Relationship history for MSHA mine 1513441

Current hierarchy: **Keown Randle → Bon Harbor Coal Company Inc → Curtis 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:** Anne  Hoke et al → Curtis Mine; 1974-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hoke Company Inc → Curtis Mine; 1982-04-01 to 1983-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Anne  Hoke et al → Hoke Company Inc; 1982-04-01 to 1983-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Hoke et al → Hoke Company Inc; 1982-04-01 to 1983-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Keown Randle → Curtis Mine; 1983-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bon Harbor Coal Company Inc → Curtis Mine; 1983-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keown Randle → Bon Harbor Coal Company Inc; 1983-09-08 to current/open; source msha-controller-operator-history