# Relationship history for MSHA mine 1600992

Current hierarchy: **Stogner Ralph → Stogner Gravel Supplies Inc → Stogner Gravel Supplies 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:** Large Gravel & Sand Company → Stogner Gravel Supplies Incorporated; 1980-09-01 to 1981-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Malachi → Stogner Gravel Supplies Incorporated; 1980-09-01 to 1981-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Malachi → Large Gravel & Sand Company; 1980-09-01 to 1981-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Stogner Gravel Supplies Inc → Stogner Gravel Supplies Incorporated; 1981-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stogner Ralph → Stogner Gravel Supplies Incorporated; 1981-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stogner Ralph → Stogner Gravel Supplies Inc; 1981-01-29 to current/open; source msha-controller-operator-history