# Relationship history for MSHA mine 1505368

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

- **operator_operates_mine:** Newcon Coals Inc → Gerlinda Tipple; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_mine:** James A  Sigmon → Gerlinda Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Sigmon → Newcon Coals Inc; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Pargas Inc → Gerlinda Tipple; 1973-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Coals Inc → Gerlinda Tipple; 1979-10-01 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Lost Mountain Mining Inc → Gerlinda Tipple; 1979-10-16 to 1981-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Lost Mountain Mining Inc; 1979-10-16 to 1981-01-06; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Gerlinda Tipple; 1981-01-07 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Pargas Inc → River Processing Inc; 1981-01-07 to 1983-12-20; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Gerlinda Tipple; 1983-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coal Ridge Fuels Of Hazard Inc → Gerlinda Tipple; 1983-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Ridge Fuels Of Hazard Inc → River Processing Inc; 1983-12-21 to current/open; source msha-controller-operator-history