# Relationship history for MSHA mine 4104815

Current hierarchy: **Blake  Frerich → Frerich Materials L.L.C. → Simons 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:** Frerich Materials L.L.C. → Simons Pit; 2010-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blake  Frerich → Simons Pit; 2010-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blake  Frerich → Frerich Materials L.L.C.; 2010-03-09 to current/open; source msha-controller-operator-history