# Relationship history for MSHA mine 0800693

Current hierarchy: **Valerie  Carnes → Standard Sand & Silica Company → Wallace Mine**

- 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:** Standard Sand & Silica Company → Wallace Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lemuel Baylis  Carnes III → Wallace Mine; 1950-01-01 to 2024-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Lemuel Baylis  Carnes III → Standard Sand & Silica Company; 1950-01-01 to 2024-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Valerie  Carnes → Wallace Mine; 2024-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valerie  Carnes → Standard Sand & Silica Company; 2024-02-26 to current/open; source msha-controller-operator-history