# Relationship history for MSHA mine 4701418

Current hierarchy: **Chris E  Winger → Winger Concrete Products Inc. → Winger Concrete Products, Inc.**

- 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:** Tomahawk Sand & Gravel Company Inc → Winger Concrete Products, Inc.; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Gene  Heikkenen → Winger Concrete Products, Inc.; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Heikkenen → Tomahawk Sand & Gravel Company Inc; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Chris E  Winger et al → Winger Concrete Products, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tomahawk Sand & Gravel Company Inc → Winger Concrete Products, Inc.; 1985-04-01 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Chris E  Winger et al → Winger Concrete Products, Inc.; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris E  Winger et al → Tomahawk Sand & Gravel Company Inc; 1985-04-01 to 2005-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Winger Concrete Products Inc. → Winger Concrete Products, Inc.; 2005-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris E  Winger et al → Winger Concrete Products Inc.; 2005-06-01 to current/open; source msha-controller-operator-history