# Relationship history for MSHA mine 0402550

Current hierarchy: **Wilbur-Ellis Company → Kcac Inc → JOE 5 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:** Calidria Corp → JOE 5 PIT; 1950-01-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → JOE 5 PIT; 1950-01-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Calidria Corp; 1950-01-01 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Kcac Inc → JOE 5 PIT; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilbur-Ellis Company → JOE 5 PIT; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilbur-Ellis Company → Kcac Inc; 1985-07-01 to current/open; source msha-controller-operator-history