# Relationship history for MSHA mine 3002680

Current hierarchy: **Steven D  Montemorano → Montemorano Bros Inc → Potter Pit**

- 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

- **operator_operates_mine:** Hey'S Enterprises Inc → Potter Pit; 1985-04-01 to 2015-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Doug  Hey → Potter Pit; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Hey → Hey'S Enterprises Inc; 1985-04-01 to 2015-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Steven D  Montemorano → Potter Pit; 1996-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montemorano Bros Inc → Potter Pit; 2015-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven D  Montemorano → Montemorano Bros Inc; 2015-05-12 to current/open; source msha-controller-operator-history