# Relationship history for MSHA mine 0504633

Current hierarchy: **Dennis D  Walker → Denco of Pagosa LLC → Denco of Pagosa LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Denco of Pagosa LLC → Denco of Pagosa LLC; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis D  Walker → Denco of Pagosa LLC; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis D  Walker → Denco of Pagosa LLC; 1999-01-01 to current/open; source msha-controller-operator-history