# Relationship history for MSHA mine 2103099

Current hierarchy: **Stephen B Rentz → Central Concrete, Inc. → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Sioux Valley Aggregates Inc → WASH PLANT; 1995-05-01 to 2001-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Sunderman → WASH PLANT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Sunderman → Sioux Valley Aggregates Inc; 1995-05-01 to 2001-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Central Concrete, Inc. → WASH PLANT; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen B Rentz → WASH PLANT; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen B Rentz → Central Concrete, Inc.; 2001-04-01 to current/open; source msha-controller-operator-history