# Relationship history for MSHA mine 4503621

Current hierarchy: **Brent A  Rotschy → Rotschy Inc. → East County Materials**

- 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:** Rotschy Inc. → East County Materials; 2006-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent A  Rotschy → East County Materials; 2006-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent A  Rotschy → Rotschy Inc.; 2006-12-26 to current/open; source msha-controller-operator-history