# Relationship history for MSHA mine 1302445

Current hierarchy: **Josh  Amonson; Brad  Schmidt → Central Iowa Dirt & Demo LLC → Woolstock**

- 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:** Central Iowa Dirt & Demo LLC → Woolstock; 2015-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Josh  Amonson et al → Woolstock; 2015-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Josh  Amonson et al → Central Iowa Dirt & Demo LLC; 2015-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Schmidt et al → Central Iowa Dirt & Demo LLC; 2015-01-22 to current/open; source msha-controller-operator-history