# Relationship history for MSHA mine 2002748

Current hierarchy: **Jeffery J  Stansley → Adrian Sand & Stone Inc → Plant #2**

- 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:** Jeffery J  Stansley et al → Plant #2; 1979-08-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adrian Sand & Stone Inc → Plant #2; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery J  Stansley et al → Adrian Sand & Stone Inc; 1986-04-01 to current/open; source msha-controller-operator-history