# Relationship history for MSHA mine 4200964

Current hierarchy: **Shumway Dan → Dan Shumway Mining → Glade 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

- **controller_controls_mine:** Shumway Dan → Glade Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Inc → Glade Mine; 1950-01-01 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Williams W R → Glade Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams W R → Williams Inc; 1950-01-01 to 1978-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Dan Shumway Mining → Glade Mine; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shumway Dan → Dan Shumway Mining; 1978-08-01 to current/open; source msha-controller-operator-history