# Relationship history for MSHA mine 2602851

Current hierarchy: **Quanta Services Inc → CONAM Construction → Wheeler Rental MASABA 36**

- 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:** CONAM Construction → Wheeler Rental MASABA 36; 2020-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quanta Services Inc → Wheeler Rental MASABA 36; 2020-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quanta Services Inc → CONAM Construction; 2020-01-23 to current/open; source msha-controller-operator-history