# Relationship history for MSHA mine 4606157

Current hierarchy: **Chw Industries Inc → C W Bentley Inc → Mine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Chafin Jon N → Mine No 2; 1978-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hart Coal Company Inc → Mine No 2; 1980-05-01 to 1982-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Hart Reuben F → Mine No 2; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hart Reuben F → Hart Coal Company Inc; 1980-05-01 to 1982-03-09; source msha-controller-operator-history
- **operator_operates_mine:** International Coal Company Inc → Mine No 2; 1982-03-10 to 1984-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Chafin Jon N → International Coal Company Inc; 1982-03-10 to 1984-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Chw Industries Inc → Mine No 2; 1982-09-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C W Bentley Inc → Mine No 2; 1984-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chw Industries Inc → C W Bentley Inc; 1984-06-07 to current/open; source msha-controller-operator-history