# Relationship history for MSHA mine 1513941

Current hierarchy: **Holland Lawrence → A & B Construction → No 1 Site**

- 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:** A & B Construction → No 1 Site; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holland Lawrence → No 1 Site; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holland Lawrence → A & B Construction; 1983-02-01 to current/open; source msha-controller-operator-history