# Relationship history for MSHA mine 1511089

Current hierarchy: **Coal Ridge Fuels Of Hazard Inc → River Processing Inc → Simon Tipple**

- 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:** Johnson Ralph → Simon Tipple; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R J F Coal Company → Simon Tipple; 1978-03-01 to 1985-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ralph → R J F Coal Company; 1978-03-01 to 1985-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Coal Ridge Fuels Of Hazard Inc → Simon Tipple; 1983-12-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Simon Tipple; 1985-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Ridge Fuels Of Hazard Inc → River Processing Inc; 1985-05-10 to current/open; source msha-controller-operator-history