# Relationship history for MSHA mine 3604658

Current hierarchy: **Donald  Royer; Gerald R  Royer → Royers Lime Quarries → ROYER'S LIME 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:** Royers Lime Quarries → ROYER'S LIME QUARRIES; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Royer et al → ROYER'S LIME QUARRIES; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Royer et al → Royers Lime Quarries; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald R  Royer et al → Royers Lime Quarries; 1950-01-01 to current/open; source msha-controller-operator-history