# Relationship history for MSHA mine 3000988

Current hierarchy: **Power & Construction Group Inc → Valley Sand & Gravel Inc → Valley Sand & Gravel Incorporated**

- 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:** Valley Sand & Gravel Corp → Valley Sand & Gravel Incorporated; 1950-01-01 to 1983-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Finewood → Valley Sand & Gravel Incorporated; 1950-01-01 to 1983-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Finewood → Valley Sand & Gravel Corp; 1950-01-01 to 1983-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Valley Sand & Gravel Inc → Valley Sand & Gravel Incorporated; 1983-07-12 to 1994-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Ash → Valley Sand & Gravel Incorporated; 1983-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Ash → Valley Sand & Gravel Inc; 1983-07-12 to 1994-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Valley Sand & Gravel Inc → Valley Sand & Gravel Incorporated; 1994-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Power & Construction Group Inc → Valley Sand & Gravel Incorporated; 1994-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Power & Construction Group Inc → Valley Sand & Gravel Inc; 1994-06-02 to current/open; source msha-controller-operator-history