# Relationship history for MSHA mine 4407373

Current hierarchy: **Darrell  Grigsby → Maven Energy, LLC → Jeffrey HWM**

- 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:** Darrell  Grigsby → Jeffrey HWM; 2016-07-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maven Energy, LLC → Jeffrey HWM; 2017-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Grigsby → Maven Energy, LLC; 2017-06-16 to current/open; source msha-controller-operator-history