# Relationship history for MSHA mine 3606776

Current hierarchy: **C Alan  Walker → Al Hamilton Contracting Company Inc → Hamilton Strip #2**

- 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

- **controller_controls_mine:** Aldean  Hamilton → Hamilton Strip #2; 1950-01-01 to 1985-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Al Hamilton Contracting Company Inc → Hamilton Strip #2; 1979-01-01 to 1985-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Aldean  Hamilton → Al Hamilton Contracting Company Inc; 1979-01-01 to 1985-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Al Hamilton Contracting Company Inc → Hamilton Strip #2; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** C Alan  Walker → Hamilton Strip #2; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C Alan  Walker → Al Hamilton Contracting Company Inc; 1985-07-17 to current/open; source msha-controller-operator-history