# Relationship history for MSHA mine 2700507

Current hierarchy: **Michael  Brown; Kevin  Brown → Northeast Sand and Gravel LLC → Milford Location**

- 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:** Kevin  Brown et al → Milford Location; 2015-04-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northeast Sand and Gravel LLC → Milford Location; 2018-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Brown et al → Northeast Sand and Gravel LLC; 2018-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Brown et al → Northeast Sand and Gravel LLC; 2018-07-24 to current/open; source msha-controller-operator-history