# Relationship history for MSHA mine 1516264

Current hierarchy: **Hayes Randall A → Hayes Inc → Surface Mine A**

- 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

- **controller_controls_mine:** Hayes Randall A Et Al → Surface Mine A; 1979-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hayes Inc → Surface Mine A; 1987-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hayes Randall A Et Al → Hayes Inc; 1987-12-01 to current/open; source msha-controller-operator-history