# Relationship history for MSHA mine 1202542

Current hierarchy: **Randy  Denney → Denney Excavating, Inc. → Chieftain 2200 #537**

- 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:** Randy  Denney → Chieftain 2200 #537; 2023-04-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Denney Excavating, Inc. → Chieftain 2200 #537; 2026-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Denney → Denney Excavating, Inc.; 2026-09-29 to current/open; source msha-controller-operator-history