# Relationship history for MSHA mine 1401571

Current hierarchy: **Victor S  Klotz; Christie  Klotz → Klotz Sand Co., Inc. → Klotz Sand Co., 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

- **controller_controls_mine:** Christie  Klotz et al → Klotz Sand Co., Inc.; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Klotz Sand Co., Inc. → Klotz Sand Co., Inc.; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christie  Klotz et al → Klotz Sand Co., Inc.; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor S  Klotz et al → Klotz Sand Co., Inc.; 1993-06-01 to current/open; source msha-controller-operator-history