# Relationship history for MSHA mine 1401787

Current hierarchy: **Larry  Randall → Ford Sand and Gravel Inc. → Ashland Aggregate**

- 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

- **controller_controls_mine:** Larry  Randall → Ashland Aggregate; 1992-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ford Sand and Gravel Inc. → Ashland Aggregate; 2017-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Randall → Ford Sand and Gravel Inc.; 2017-05-15 to current/open; source msha-controller-operator-history