# Relationship history for MSHA mine 1101150

Current hierarchy: **Joseph A  Scharf → Sand Valley Sand & Gravel Inc → Sand Valley Sand & Gravel 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Lewis & Company → Sand Valley Sand & Gravel Inc; 1950-01-01 to 1983-07-04; source msha-controller-operator-history
- **controller_controls_mine:** James R  Lewis → Sand Valley Sand & Gravel Inc; 1950-01-01 to 1983-07-04; source msha-controller-operator-history
- **controller_controls_operator:** James R  Lewis → Lewis & Company; 1950-01-01 to 1983-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Sand Valley Sand & Gravel Inc → Sand Valley Sand & Gravel Inc; 1983-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Melvin  Price → Sand Valley Sand & Gravel Inc; 1983-07-05 to 2024-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Price → Sand Valley Sand & Gravel Inc; 1983-07-05 to 2024-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Joseph A  Scharf et al → Sand Valley Sand & Gravel Inc; 2024-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Scharf et al → Sand Valley Sand & Gravel Inc; 2024-07-21 to current/open; source msha-controller-operator-history