# Relationship history for MSHA mine 0201977

Current hierarchy: **William E  Hintze → Standard Concrete Inc → Standard Concrete Incorporated**

- 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:** Pioneer Materials Inc → Standard Concrete Incorporated; 1980-03-01 to 1981-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Kuwitzky Dan → Standard Concrete Incorporated; 1980-03-01 to 1981-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Kuwitzky Dan → Pioneer Materials Inc; 1980-03-01 to 1981-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Standard Concrete Inc → Standard Concrete Incorporated; 1981-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William E  Hintze → Standard Concrete Incorporated; 1981-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Hintze → Standard Concrete Inc; 1981-04-15 to current/open; source msha-controller-operator-history