# Relationship history for MSHA mine 2200628

Current hierarchy: **Michael A  Bush → Hot Mix Asphalt Inc → Pearl River Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Michael A  Bush  et al → Pearl River Sand & Gravel; 1990-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & D Mining Company → Pearl River Sand & Gravel; 1990-11-01 to 1991-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Wheat Joseph T → Pearl River Sand & Gravel; 1990-11-01 to 1991-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Wheat Joseph T → A & D Mining Company; 1990-11-01 to 1991-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Hot Mix Asphalt Inc → Pearl River Sand & Gravel; 1991-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Bush  et al → Hot Mix Asphalt Inc; 1991-07-10 to current/open; source msha-controller-operator-history