# Relationship history for MSHA mine 0501653

Current hierarchy: **Reams John → Reams Construction Company → Ura Mine**

- 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:** Umetco Minerals Corp → Ura Mine; 1950-01-01 to 1988-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → Ura Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Umetco Minerals Corp; 1950-01-01 to 1988-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Reams Construction Company → Ura Mine; 1988-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reams John → Ura Mine; 1988-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reams John → Reams Construction Company; 1988-04-12 to current/open; source msha-controller-operator-history