# Relationship history for MSHA mine 0202083

Current hierarchy: **Hillbrands Ted & Arie → Ted & Arie Hillbrands → San Marcos 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ted & Arie Hillbrands → San Marcos Mine; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hillbrands Ted & Arie → San Marcos Mine; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hillbrands Ted & Arie → Ted & Arie Hillbrands; 1982-01-01 to current/open; source msha-controller-operator-history