# Relationship history for MSHA mine 2602680

Current hierarchy: **Michael Charles  Weitman → Nyecon → Rock Valley Community 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:** NyeCon Inc → Rock Valley Community Pit; 2010-03-17 to 2010-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Michael Charles  Weitman → Rock Valley Community Pit; 2010-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Charles  Weitman → NyeCon Inc; 2010-03-17 to 2010-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Nyecon → Rock Valley Community Pit; 2010-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael Charles  Weitman → Rock Valley Community Pit; 2010-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Charles  Weitman → Nyecon; 2010-08-30 to current/open; source msha-controller-operator-history