# Relationship history for MSHA mine 3608929

Current hierarchy: **Todd  Groover → Todd Groover Flagstone → GROOVER #1**

- 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:** Todd  Groover → GROOVER #1; 2001-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Todd Groover Flagstone → GROOVER #1; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Groover → Todd Groover Flagstone; 2001-03-01 to current/open; source msha-controller-operator-history