# Relationship history for MSHA mine 3610473

Current hierarchy: **Robert H  Schneider → EMCL Quarry LLC → EMCL Quarries**

- 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:** EMCL Quarry LLC → EMCL Quarries; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert H  Schneider → EMCL Quarries; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert H  Schneider → EMCL Quarry LLC; 2025-06-25 to current/open; source msha-controller-operator-history