# Relationship history for MSHA mine 3200992

Current hierarchy: **Kirk  Wold; Nevin  Dahl → Lynx Sand & Gravel, L.L.C. → Plant 1**

- 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:** Lynx Sand & Gravel, L.L.C. → Plant 1; 2012-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kirk  Wold et al → Plant 1; 2012-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk  Wold et al → Lynx Sand & Gravel, L.L.C.; 2012-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nevin  Dahl et al → Lynx Sand & Gravel, L.L.C.; 2012-09-14 to current/open; source msha-controller-operator-history