# Relationship history for MSHA mine 4201262

Current hierarchy: **Shumway Robert → Shumway Drilling & Mining Company → Dim Light 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Uranium Production Company Inc → Dim Light Mine; 1950-01-01 to 1978-12-25; source msha-controller-operator-history
- **controller_controls_mine:** Uranium Production Company Inc → Dim Light Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Uranium Production Company Inc → Uranium Production Company Inc; 1950-01-01 to 1978-12-25; source msha-controller-operator-history
- **operator_operates_mine:** Shumway Drilling & Mining Company → Dim Light Mine; 1978-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shumway Robert → Dim Light Mine; 1978-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shumway Robert → Shumway Drilling & Mining Company; 1978-12-26 to current/open; source msha-controller-operator-history