# Relationship history for MSHA mine 4604990

Current hierarchy: **Hall Henry → Adanac Coal Company Inc → Adanac Surface No 1**

- 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:** Hall Henry → Adanac Surface No 1; 1974-07-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adanac Coal Company Inc → Adanac Surface No 1; 1976-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Henry → Adanac Coal Company Inc; 1976-01-05 to current/open; source msha-controller-operator-history