# Relationship history for MSHA mine 1001870

Current hierarchy: **Kevin  Siepert; Milo  Siepert → Siepert Crushing, Inc. → Siepert's Crushing**

- 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:** Siepert Crushing, Inc. → Siepert's Crushing; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Siepert et al → Siepert's Crushing; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Siepert et al → Siepert Crushing, Inc.; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milo  Siepert et al → Siepert Crushing, Inc.; 1991-06-01 to current/open; source msha-controller-operator-history