# Relationship history for MSHA mine 2902513

Current hierarchy: **Mark  Ciganovich → Ciganovich-Construction → Parker 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ciganovich-Construction → Parker Pit; 2020-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Ciganovich → Parker Pit; 2020-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Ciganovich → Ciganovich-Construction; 2020-05-10 to current/open; source msha-controller-operator-history