# Relationship history for MSHA mine 0302074

Current hierarchy: **Steven R  Adkins → ADCO Excavation, LLC → Alternative Materials AR**

- 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:** ADCO Excavation, LLC → Alternative Materials AR; 2020-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steven R  Adkins → Alternative Materials AR; 2020-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven R  Adkins → ADCO Excavation, LLC; 2020-11-06 to current/open; source msha-controller-operator-history