# Relationship history for MSHA mine 4102810

Current hierarchy: **Zachry Corporation → Capitol Aggregates, Inc. → Delta Materials**

- 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

- **controller_controls_mine:** Zachry Corporation → Delta Materials; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delta Materials Corp → Delta Materials; 1979-01-01 to 1988-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Allen R  Lott → Delta Materials; 1979-01-01 to 1988-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Allen R  Lott → Delta Materials Corp; 1979-01-01 to 1988-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Aggregates, Inc. → Delta Materials; 1988-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zachry Corporation → Capitol Aggregates, Inc.; 1988-11-10 to current/open; source msha-controller-operator-history