# Relationship history for MSHA mine 3607552

Current hierarchy: **Blascovich Ben & William T Rumberger → Bald Eagle Coal Company → Bald Eagle Strip**

- 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:** White Pine Coal Company Inc → Bald Eagle Strip; 1984-03-01 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Nancy L  Lindenmuth → Bald Eagle Strip; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy L  Lindenmuth → White Pine Coal Company Inc; 1984-03-01 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Blascovich Ben & William T Rumberger → Bald Eagle Strip; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bald Eagle Coal Company → Bald Eagle Strip; 1988-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blascovich Ben & William T Rumberger → Bald Eagle Coal Company; 1988-02-24 to current/open; source msha-controller-operator-history