# Relationship history for MSHA mine 1513021

Current hierarchy: **Robert W  Miller; Dean  Miller → Miller Brothers Construction Inc → Miller Bros #2 Surface Mine**

- 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:** Miller Brothers Construction Inc → Miller Bros #2 Surface Mine; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dean  Miller Et Al → Miller Bros #2 Surface Mine; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Miller Et Al → Miller Brothers Construction Inc; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Miller Et Al → Miller Brothers Construction Inc; 1981-07-01 to current/open; source msha-controller-operator-history