# Relationship history for MSHA mine 1513201

Current hierarchy: **Crawford Lawrence & Dennis Ray → Crawford Brothers Trucking → No 1 Surface**

- 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:** Crawford Lawrence → No 1 Surface; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & D Coal Company → No 1 Surface; 1981-11-01 to 1982-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Lawrence → D & D Coal Company; 1981-11-01 to 1982-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Crawford Brothers Trucking → No 1 Surface; 1982-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crawford Lawrence & Dennis Ray → No 1 Surface; 1982-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Lawrence & Dennis Ray → Crawford Brothers Trucking; 1982-05-11 to current/open; source msha-controller-operator-history