# Relationship history for MSHA mine 3503787

Current hierarchy: **Ron  Hailicka → RON HAILICKA EQUIPMENT, INC. → COBLEIGH 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:** RON HAILICKA EQUIPMENT, INC. → COBLEIGH PIT; 2012-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Hailicka → COBLEIGH PIT; 2012-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Hailicka → RON HAILICKA EQUIPMENT, INC.; 2012-10-23 to current/open; source msha-controller-operator-history