# Relationship history for MSHA mine 3609953

Current hierarchy: **Robert H  Schneider → Robert Schneider → Robert Schneider Quarry**

- 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:** Robert Schneider → Robert Schneider Quarry; 2011-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert H  Schneider → Robert Schneider Quarry; 2011-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert H  Schneider → Robert Schneider; 2011-09-07 to current/open; source msha-controller-operator-history