# Relationship history for MSHA mine 1513297

Current hierarchy: **Hatton Billy → Briar Coal Company → No 2**

- 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:** Kim Coal Company → No 2; 1982-03-01 to 1983-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Sexton Burnis & Earnest Cook → No 2; 1982-03-01 to 1983-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Sexton Burnis & Earnest Cook → Kim Coal Company; 1982-03-01 to 1983-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Briar Coal Company → No 2; 1983-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hatton Billy Et Al → No 2; 1983-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hatton Billy Et Al → Briar Coal Company; 1983-03-17 to current/open; source msha-controller-operator-history