# Relationship history for MSHA mine 4801308

Current hierarchy: **Donald R Corson Jr → C & B Sand & Gravel → C & B SAND & GRAVEL**

- 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:** C & B Sand & Gravel → C & B SAND & GRAVEL; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald Ralph  Corson Jr et al → C & B SAND & GRAVEL; 1980-02-01 to 2022-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Donald Ralph  Corson Jr et al → C & B Sand & Gravel; 1980-02-01 to 2022-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Donald R Corson Jr → C & B SAND & GRAVEL; 2022-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R Corson Jr → C & B Sand & Gravel; 2022-07-11 to current/open; source msha-controller-operator-history