# Relationship history for MSHA mine 1601232

Current hierarchy: **Ray  Graham; A D  Trest → Rebel Sand & Gravel Company Inc → Plant #8**

- 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:** A D  Trest et al → Plant #8; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rebel Sand & Gravel Company Inc → Plant #8; 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A D  Trest et al → Rebel Sand & Gravel Company Inc; 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Graham et al → Rebel Sand & Gravel Company Inc; 1991-12-01 to current/open; source msha-controller-operator-history