# Relationship history for MSHA mine 0901030

Current hierarchy: **Henry  Hamilton → Hamilton Construction Inc → Avant Pit**

- 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:** Hamilton Construction Inc → Avant Pit; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henry  Hamilton → Avant Pit; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Hamilton → Hamilton Construction Inc; 1988-08-01 to current/open; source msha-controller-operator-history