# Relationship history for MSHA mine 3502481

Current hierarchy: **Scott T  Parker → Columbia Road & Driveway Inc → COLUMBIA ROAD & DRIVEWAY, INC.**

- 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

- **operator_operates_mine:** B & B Excavating → COLUMBIA ROAD & DRIVEWAY, INC.; 1950-01-01 to 1990-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Baker J A → COLUMBIA ROAD & DRIVEWAY, INC.; 1950-01-01 to 1990-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Baker J A → B & B Excavating; 1950-01-01 to 1990-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Road & Driveway Inc → COLUMBIA ROAD & DRIVEWAY, INC.; 1990-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott T  Parker → COLUMBIA ROAD & DRIVEWAY, INC.; 1990-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott T  Parker → Columbia Road & Driveway Inc; 1990-10-10 to current/open; source msha-controller-operator-history