# Relationship history for MSHA mine 4002413

Current hierarchy: **White Coralie → Barnwell Coal Company → Mine 1-2 Barnwell Coal Co**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Barnwell Coal Company → Mine 1-2 Barnwell Coal Co; 1978-04-01 to 1983-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Barnwell Industries Inc → Mine 1-2 Barnwell Coal Co; 1978-04-01 to 1983-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Barnwell Industries Inc → Barnwell Coal Company; 1978-04-01 to 1983-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Barnwell Coal Company → Mine 1-2 Barnwell Coal Co; 1983-02-02 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Schwermer T F & Harry Thompson → Mine 1-2 Barnwell Coal Co; 1983-02-02 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Schwermer T F & Harry Thompson → Barnwell Coal Company; 1983-02-02 to 1983-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Barnwell Coal Company → Mine 1-2 Barnwell Coal Co; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Coralie → Mine 1-2 Barnwell Coal Co; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Coralie → Barnwell Coal Company; 1983-06-01 to current/open; source msha-controller-operator-history