# Relationship history for MSHA mine 2700323

Current hierarchy: **Carl  Moulton → Rt 12a Sand & Gravel → RT. 12A SAND & GRAVEL**

- 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:** Rt 12a Sand & Gravel → RT. 12A SAND & GRAVEL; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Moulton → RT. 12A SAND & GRAVEL; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Moulton → Rt 12a Sand & Gravel; 1998-03-01 to current/open; source msha-controller-operator-history