# Relationship history for MSHA mine 3606045

Current hierarchy: **Casey Robert W → R W Casey Contracting Company → Reclamation Project 269 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:** R W Casey Contracting Company → Reclamation Project 269 Strip; 1975-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Casey Robert W → Reclamation Project 269 Strip; 1975-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Casey Robert W → R W Casey Contracting Company; 1975-12-01 to current/open; source msha-controller-operator-history