# Relationship history for MSHA mine 2200641

Current hierarchy: **L C  Hill → Hill & Hill Construction Company Inc → Pit #2**

- 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

- **controller_controls_mine:** L C  Hill → Pit #2; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hill & Hill Construction Company Inc → Pit #2; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L C  Hill → Hill & Hill Construction Company Inc; 1992-07-01 to current/open; source msha-controller-operator-history