# Relationship history for MSHA mine 0504710

Current hierarchy: **Michael Jon  Vandenburg → L.C.I. → SUMMIT CLAY PITS - L.C.I. Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** L.C.I. → SUMMIT CLAY PITS - L.C.I. Inc.; 2012-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael Jon  Vandenburg → SUMMIT CLAY PITS - L.C.I. Inc.; 2012-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Jon  Vandenburg → L.C.I.; 2012-01-15 to current/open; source msha-controller-operator-history