# Relationship history for MSHA mine 2103321

Current hierarchy: **KEN  STEINMETZ → STEINMETZ AGGREGATE PRODUCTS → EL-JAY PLANT - 1**

- 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:** STEINMETZ AGGREGATE PRODUCTS → EL-JAY PLANT - 1; 2002-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** KEN  STEINMETZ → EL-JAY PLANT - 1; 2002-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** KEN  STEINMETZ → STEINMETZ AGGREGATE PRODUCTS; 2002-06-05 to current/open; source msha-controller-operator-history