# Relationship history for MSHA mine 1400557

Current hierarchy: **Klaver Construction Company Incorporated → Klaver Construction Products LLC → Klaver Construction Products Pratt Sand**

- 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:** Whitfield Sand & Concrete Inc → Klaver Construction Products Pratt Sand; 1950-01-01 to 2002-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Joel D  Whitfield et al → Klaver Construction Products Pratt Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel D  Whitfield et al → Whitfield Sand & Concrete Inc; 1950-01-01 to 2002-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Klaver Construction Products LLC → Klaver Construction Products Pratt Sand; 2002-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Klaver Construction Company Incorporated → Klaver Construction Products Pratt Sand; 2002-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klaver Construction Company Incorporated → Klaver Construction Products LLC; 2002-05-01 to current/open; source msha-controller-operator-history