# Relationship history for MSHA mine 4103303

Current hierarchy: **Schumacher Marvin → S & M Materials → Berger 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:** S & M Materials → Berger Pit; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schumacher Marvin → Berger Pit; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schumacher Marvin → S & M Materials; 1985-04-01 to current/open; source msha-controller-operator-history