# Relationship history for MSHA mine 4103005

Current hierarchy: **Emery Douglas & Tommy L Burns → B & E Sand & Gravel → B & E Sand & Gravel Wash Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Crockett Materials Corp → B & E Sand & Gravel Wash Plant; 1980-05-01 to 1983-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Crockett Charles H → B & E Sand & Gravel Wash Plant; 1980-05-01 to 1983-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Crockett Charles H → Crockett Materials Corp; 1980-05-01 to 1983-08-22; source msha-controller-operator-history
- **operator_operates_mine:** B & E Sand & Gravel → B & E Sand & Gravel Wash Plant; 1983-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emery Douglas & Tommy L Burns → B & E Sand & Gravel Wash Plant; 1983-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emery Douglas & Tommy L Burns → B & E Sand & Gravel; 1983-08-23 to current/open; source msha-controller-operator-history