# Relationship history for MSHA mine 4502510

Current hierarchy: **Sygitowicz Bill → Cascade Roads Inc → North Big Deer 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:** U S Forest Service → North Big Deer Pit; 1950-01-01 to 1979-04-02; source msha-controller-operator-history
- **controller_controls_mine:** United States Government → North Big Deer Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Forest Service; 1950-01-01 to 1979-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Cascade Roads Inc → North Big Deer Pit; 1979-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sygitowicz Bill → North Big Deer Pit; 1979-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sygitowicz Bill → Cascade Roads Inc; 1979-04-03 to current/open; source msha-controller-operator-history