# Relationship history for MSHA mine 2402629

Current hierarchy: **Mike  Sweeney → Summit Energy Services → Linde 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Mike  Sweeney et al → Linde Pit; 2011-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Summit Energy Services → Linde Pit; 2012-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Sweeney et al → Summit Energy Services; 2012-06-21 to current/open; source msha-controller-operator-history