# Relationship history for MSHA mine 2102848

Current hierarchy: **Tom M  Sterzinger → Sterzinger Crushing Inc → Sterzinger Crushing Inc**

- 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:** Sterzinger Construction → Sterzinger Crushing Inc; 1981-06-01 to 2013-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Tom M  Sterzinger → Sterzinger Crushing Inc; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom M  Sterzinger → Sterzinger Construction; 1981-06-01 to 2013-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Tom M  Sterzinger → Sterzinger Crushing Inc; 2006-05-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sterzinger Crushing Inc → Sterzinger Crushing Inc; 2013-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom M  Sterzinger → Sterzinger Crushing Inc; 2013-07-26 to current/open; source msha-controller-operator-history