# Relationship history for MSHA mine 2501323

Current hierarchy: **Travis  Sondgeroth; Brian  Buckingham; Kirk  Havranek; Tom  Rogge → Plains Sand & Gravel → Springfield**

- 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:** Plains Sand & Gravel → Springfield; 2024-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian  Buckingham et al → Springfield; 2024-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Buckingham et al → Plains Sand & Gravel; 2024-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk  Havranek et al → Plains Sand & Gravel; 2024-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Sondgeroth et al → Plains Sand & Gravel; 2024-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Rogge et al → Plains Sand & Gravel; 2024-03-13 to current/open; source msha-controller-operator-history