# Relationship history for MSHA mine 3607170

Current hierarchy: **Stephen  Mazur Jr → Sunray Coal Inc → Hammond 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:** Sunray Coal Inc → Hammond Strip; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Mazur Jr → Hammond Strip; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Mazur Jr → Sunray Coal Inc; 1981-07-01 to current/open; source msha-controller-operator-history