# Relationship history for MSHA mine 1102642

Current hierarchy: **Pyro Energy Corp → Somerset Mining Company → Somerset No 1 Mine-Strip**

- 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:** Somerset Mining Company → Somerset No 1 Mine-Strip; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pyro Energy Corp → Somerset No 1 Mine-Strip; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pyro Energy Corp → Somerset Mining Company; 1978-06-01 to current/open; source msha-controller-operator-history