# Relationship history for MSHA mine 4701498

Current hierarchy: **Joan  Wimmer → Wimmer Granite & Supply Inc → WIMMER GRANITE & SUPPLY, 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Carl Wimmer Granite → WIMMER GRANITE & SUPPLY, INC.; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Wimmer → WIMMER GRANITE & SUPPLY, INC.; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Wimmer → Carl Wimmer Granite; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Wimmer Granite & Supply Inc → WIMMER GRANITE & SUPPLY, INC.; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joan  Wimmer → WIMMER GRANITE & SUPPLY, INC.; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joan  Wimmer → Wimmer Granite & Supply Inc; 1985-04-01 to current/open; source msha-controller-operator-history