# Relationship history for MSHA mine 2602495

Current hierarchy: **Steve M  Constant → Birthday Girl Project → Birthday Girl Project**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Birthday Girl Project → Birthday Girl Project; 2000-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve M  Constant → Birthday Girl Project; 2000-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve M  Constant → Birthday Girl Project; 2000-12-20 to current/open; source msha-controller-operator-history