# Relationship history for MSHA mine 3605042

Current hierarchy: **Houser William C → William C Houser → Hadden Strip**

- 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:** William C Houser → Hadden Strip; 1974-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Houser William C → Hadden Strip; 1974-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houser William C → William C Houser; 1974-06-15 to current/open; source msha-controller-operator-history