# Relationship history for MSHA mine 3605727

Current hierarchy: **Keihl Darrell J → Somerset Mines Inc → Stoystown 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tri-C Coal Company Inc → Stoystown Tipple; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Vernon C & Randall C → Stoystown Tipple; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Vernon C & Randall C → Tri-C Coal Company Inc; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Somerset Mines Inc → Stoystown Tipple; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keihl Darrell J → Stoystown Tipple; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keihl Darrell J → Somerset Mines Inc; 1979-10-16 to current/open; source msha-controller-operator-history