# Relationship history for MSHA mine 0503958

Current hierarchy: **Richard  Casey → Casey Concrete Company → CHAMBERS PIT**

- 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:** Casey Concrete Company → CHAMBERS PIT; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Casey → CHAMBERS PIT; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Casey → Casey Concrete Company; 1984-05-01 to current/open; source msha-controller-operator-history