# Relationship history for MSHA mine 1103297

Current hierarchy: **Hugh  Gallivan → Mid-America Sand & Gravel Co. → 8101 Portable**

- 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

- **controller_controls_mine:** Hugh  Gallivan  et al → 8101 Portable; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-America Sand & Gravel Co. → 8101 Portable; 2019-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hugh  Gallivan  et al → Mid-America Sand & Gravel Co.; 2019-11-12 to current/open; source msha-controller-operator-history