# Relationship history for MSHA mine 1401753

Current hierarchy: **Victor S  Klotz; Christie  Klotz → KLOTZ SAND CO., INC → RITTER #19**

- 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

- **controller_controls_mine:** Victor S  Klotz et al → RITTER #19; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** KLOTZ SAND CO., INC → RITTER #19; 2012-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor S  Klotz et al → KLOTZ SAND CO., INC; 2012-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christie  Klotz et al → KLOTZ SAND CO., INC; 2012-09-18 to current/open; source msha-controller-operator-history