# Relationship history for MSHA mine 1100237

Current hierarchy: **Harold E  Wienen → E Wienen & Sons Construction Company Inc → Schultz Quarry**

- 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

- **controller_controls_mine:** Ryan Matthew J → Schultz Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold E  Wienen → Schultz Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oscar Zwolanek Lime & Gravel → Schultz Quarry; 1950-01-01 to 1979-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Zwolanek Oscar → Schultz Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zwolanek Oscar → Oscar Zwolanek Lime & Gravel; 1950-01-01 to 1979-08-08; source msha-controller-operator-history
- **operator_operates_mine:** E Wienen & Sons Construction Company Inc → Schultz Quarry; 1979-08-09 to 1980-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Wienen → E Wienen & Sons Construction Company Inc; 1979-08-09 to 1980-09-29; source msha-controller-operator-history
- **operator_operates_mine:** P W Ryan Sons Inc → Schultz Quarry; 1980-09-30 to 1981-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Ryan Matthew J → P W Ryan Sons Inc; 1980-09-30 to 1981-08-23; source msha-controller-operator-history
- **operator_operates_mine:** E Wienen & Sons Construction Company Inc → Schultz Quarry; 1981-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Wienen → E Wienen & Sons Construction Company Inc; 1981-08-24 to current/open; source msha-controller-operator-history