# Relationship history for MSHA mine 0405961

Current hierarchy: **Christopher L  Brown → Brown General Engineering, Inc → Wheelock Road Rock 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

- **operator_operates_mine:** Brown General Engineering, Inc → Wheelock Road Rock Pit; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher L  Brown → Wheelock Road Rock Pit; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher L  Brown → Brown General Engineering, Inc; 2022-07-01 to current/open; source msha-controller-operator-history