# Relationship history for MSHA mine 1516122

Current hierarchy: **Benjamin R.  Bennett → Appalachian Collieries Corp → #1 Mine**

- 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:** Cnb Coal Company Inc → #1 Mine; 1987-08-01 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Bradford Mike → #1 Mine; 1987-08-01 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Bradford Mike → Cnb Coal Company Inc; 1987-08-01 to 1988-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Collieries Corp → #1 Mine; 1988-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → #1 Mine; 1988-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Appalachian Collieries Corp; 1988-03-07 to current/open; source msha-controller-operator-history