# Relationship history for MSHA mine 3800551

Current hierarchy: **James K  Austin → Austin Construction Company Inc. → ACD Mine**

- 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:** Austin Construction Company Inc. → ACD Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James K  Austin → ACD Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James K  Austin → Austin Construction Company Inc.; 1979-01-01 to current/open; source msha-controller-operator-history