# Relationship history for MSHA mine 3800559

Current hierarchy: **Giant Group Ltd → Giant Portland & Masonry Cement Company → Harleyville 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Giant Portland & Masonry Cement Company → Harleyville Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Giant Group Ltd → Harleyville Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Giant Group Ltd → Giant Portland & Masonry Cement Company; 1979-01-01 to current/open; source msha-controller-operator-history