# Relationship history for MSHA mine 0102733

Current hierarchy: **Hyatt Randall K & Hubert D Harville → H & H Sand & Gravel → H & H Sand And Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** H & H Sand & Gravel → H & H Sand And Gravel; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hyatt Randall K & Hubert D Harville → H & H Sand And Gravel; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hyatt Randall K & Hubert D Harville → H & H Sand & Gravel; 1987-07-01 to current/open; source msha-controller-operator-history