# Relationship history for MSHA mine 0102027

Current hierarchy: **Mid South Sand & Gravel Inc → Mid South Sand & Gravel Inc → Mid South Sand And 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Mid South Sand & Gravel Inc → Mid South Sand And Gravel Incorporated; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mid South Sand & Gravel Inc → Mid South Sand And Gravel Incorporated; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mid South Sand & Gravel Inc → Mid South Sand & Gravel Inc; 1979-01-01 to current/open; source msha-controller-operator-history