# Relationship history for MSHA mine 1513853

Current hierarchy: **Hensley James E & Daugh K White → H & W Coal Company Inc → No 1 Strip**

- 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:** Hensley James E & Daugh K White Et Al → No 1 Strip; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ambition Coal Company Inc → No 1 Strip; 1982-12-01 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Crawford Dan → No 1 Strip; 1982-12-01 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Dan → Ambition Coal Company Inc; 1982-12-01 to 1983-10-12; source msha-controller-operator-history
- **operator_operates_mine:** H & W Coal Company Inc → No 1 Strip; 1983-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hensley James E & Daugh K White Et Al → H & W Coal Company Inc; 1983-10-13 to current/open; source msha-controller-operator-history