# Relationship history for MSHA mine 3609152

Current hierarchy: **Larry A  Lee → L L FLAGSTONE → GROOVER FLAGSTONE**

- 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:** Larry A  Lee → GROOVER FLAGSTONE; 2001-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L L FLAGSTONE → GROOVER FLAGSTONE; 2003-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry A  Lee → L L FLAGSTONE; 2003-05-29 to current/open; source msha-controller-operator-history