# Relationship history for MSHA mine 2602900

Current hierarchy: **Ledcor Group of Companies → Ledcor CMI Inc → Ledcor Jaw Crusher Premiertrax 400x**

- 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

- **controller_controls_mine:** Ledcor Group of Companies → Ledcor Jaw Crusher Premiertrax 400x; 2011-10-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ledcor CMI Inc → Ledcor Jaw Crusher Premiertrax 400x; 2023-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ledcor Group of Companies → Ledcor CMI Inc; 2023-12-29 to current/open; source msha-controller-operator-history