# Relationship history for MSHA mine 2200627

Current hierarchy: **Bean L W → W & B Sand & Gravel Company → Plant A**

- 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:** D S & L Gravel Inc → Plant A; 1990-11-01 to 1993-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Dedeaux Larry → Plant A; 1990-11-01 to 1993-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Dedeaux Larry → D S & L Gravel Inc; 1990-11-01 to 1993-01-25; source msha-controller-operator-history
- **operator_operates_mine:** W & B Sand & Gravel Company → Plant A; 1993-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bean L W → Plant A; 1993-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bean L W → W & B Sand & Gravel Company; 1993-01-26 to current/open; source msha-controller-operator-history