# Relationship history for MSHA mine 0301814

Current hierarchy: **Metropolitan National Bank → Central Arkansas Sand → Central Arkansas Sand**

- 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:** North Little Rock Materials Llc → Central Arkansas Sand; 1999-10-01 to 2002-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Charles R  Tankersley → Central Arkansas Sand; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles R  Tankersley → North Little Rock Materials Llc; 1999-10-01 to 2002-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Central Arkansas Sand → Central Arkansas Sand; 2002-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Metropolitan National Bank → Central Arkansas Sand; 2002-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metropolitan National Bank → Central Arkansas Sand; 2002-08-27 to current/open; source msha-controller-operator-history