# Relationship history for MSHA mine 1401777

Current hierarchy: **Matthew  Butler; Mandy  Butler → O.Z. Stone Company LLC → Fox Creek Quarry**

- 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:** O.Z. Stone Company LLC → Fox Creek Quarry; 2016-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mandy  Butler et al → Fox Creek Quarry; 2016-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mandy  Butler et al → O.Z. Stone Company LLC; 2016-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Butler et al → O.Z. Stone Company LLC; 2016-03-07 to current/open; source msha-controller-operator-history