# Relationship history for MSHA mine 1800481

Current hierarchy: **Aggregate Industries PLC → Merit Concrete Incorporated → MERIT BRANDYWINE**

- 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 H Smith → MERIT BRANDYWINE; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **controller_controls_mine:** A H  Smith → MERIT BRANDYWINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A H  Smith → A H Smith; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **operator_operates_mine:** A H Smith Associates Limited Partnership → MERIT BRANDYWINE; 1988-11-23 to 1997-08-02; source msha-controller-operator-history
- **controller_controls_mine:** A H  Smith Jr et al → MERIT BRANDYWINE; 1988-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A H  Smith Jr et al → A H Smith Associates Limited Partnership; 1988-11-23 to 1997-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Henry R  Smith et al → A H Smith Associates Limited Partnership; 1988-11-23 to 1997-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Merit Concrete Incorporated → MERIT BRANDYWINE; 1997-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → MERIT BRANDYWINE; 1997-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Merit Concrete Incorporated; 1997-08-03 to current/open; source msha-controller-operator-history