# Relationship history for MSHA mine 1517277

Current hierarchy: **Roger N  Bentley → J & R Coal Inc → #4**

- 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

- **controller_controls_mine:** Richard L  Cooper → #4; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger N  Bentley → #4; 1988-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Richardson Fuel Inc → #4; 1992-08-01 to 1992-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Cooper → Richardson Fuel Inc; 1992-08-01 to 1992-09-20; source msha-controller-operator-history
- **operator_operates_mine:** J & R Coal Inc → #4; 1992-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger N  Bentley → J & R Coal Inc; 1992-09-21 to current/open; source msha-controller-operator-history