# Relationship history for MSHA mine 3602073

Current hierarchy: **Blaschak Holding Corp → Blaschak Anthracite Corporation → Blaschak Breaker**

- 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:** Blaschak Coal Company Inc → Blaschak Breaker; 1950-01-01 to 1976-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Razzis Edward → Blaschak Breaker; 1950-01-01 to 1976-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Razzis Edward → Blaschak Coal Company Inc; 1950-01-01 to 1976-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Blaschak Coal Company Inc → Blaschak Breaker; 1976-11-09 to 1993-02-08; source msha-controller-operator-history
- **controller_controls_mine:** James  Ambrose → Blaschak Breaker; 1976-11-09 to 1993-02-08; source msha-controller-operator-history
- **controller_controls_operator:** James  Ambrose → Blaschak Coal Company Inc; 1976-11-09 to 1993-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Blaschak Holding Corp → Blaschak Breaker; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blaschak Anthracite Corporation → Blaschak Breaker; 1993-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaschak Holding Corp → Blaschak Anthracite Corporation; 1993-02-09 to current/open; source msha-controller-operator-history