# Relationship history for MSHA mine 4700816

Current hierarchy: **Lindquist Wallace A Jr → Edgerton Concrete Materials Company → EDGERTON**

- 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:** Edgerton Sand & Gravel Company Inc → EDGERTON; 1950-01-01 to 1988-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Sweeney C E → EDGERTON; 1950-01-01 to 1988-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Sweeney C E → Edgerton Sand & Gravel Company Inc; 1950-01-01 to 1988-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Edgerton Concrete Materials Company → EDGERTON; 1988-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lindquist Wallace A Jr → EDGERTON; 1988-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lindquist Wallace A Jr → Edgerton Concrete Materials Company; 1988-01-14 to current/open; source msha-controller-operator-history