# Relationship history for MSHA mine 1100074

Current hierarchy: **Anderson E L & W D O'Donnell → Gregory-Anderson Company → John'S Quarry**

- 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:** Gregory-Anderson Company → John'S Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anderson E L & W D O'Donnell → John'S Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anderson E L & W D O'Donnell → Gregory-Anderson Company; 1950-01-01 to current/open; source msha-controller-operator-history