# Relationship history for MSHA mine 0600348

Current hierarchy: **Mattioli Howard → Loma Sand & Gravel Inc → Loma Mill**

- 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:** Loma Sand & Gravel Inc → Loma Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mattioli Howard → Loma Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mattioli Howard → Loma Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history