# Relationship history for MSHA mine 1002241

Current hierarchy: **Lynn  Severance; Cari  Severance → Severance Sand & Gravel Inc. → Severance**

- 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:** Severance Sand & Gravel Inc. → Severance; 2013-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cari  Severance et al → Severance; 2013-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cari  Severance et al → Severance Sand & Gravel Inc.; 2013-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynn  Severance et al → Severance Sand & Gravel Inc.; 2013-08-20 to current/open; source msha-controller-operator-history