# Relationship history for MSHA mine 2801004

Current hierarchy: **Grace  Amadei → Mays Landing Material Handling Company Inc → MAYS LANDING MATERIAL HANDLING C**

- 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:** Mays Landing Material Handling Company Inc → MAYS LANDING MATERIAL HANDLING C; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grace  Amadei → MAYS LANDING MATERIAL HANDLING C; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grace  Amadei → Mays Landing Material Handling Company Inc; 1999-08-01 to current/open; source msha-controller-operator-history