# Relationship history for MSHA mine 1513049

Current hierarchy: **Crouse Larry → Bu Car Coal Company Inc → No 1-A**

- 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:** Shannon D Coal Company → No 1-A; 1981-07-01 to 1982-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Cook Norman & Doug Van Dyke → No 1-A; 1981-07-01 to 1982-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Cook Norman & Doug Van Dyke → Shannon D Coal Company; 1981-07-01 to 1982-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Crouse Larry → No 1-A; 1981-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bu Car Coal Company Inc → No 1-A; 1982-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crouse Larry → Bu Car Coal Company Inc; 1982-05-18 to current/open; source msha-controller-operator-history