# Relationship history for MSHA mine 0600179

Current hierarchy: **Enet Y  Silvestri; Arthur V  Silvestri Jr → East Hartford Sand & Gravel Inc → SOUTH WINDSOR PIT**

- 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:** East Hartford Sand & Gravel Inc → SOUTH WINDSOR PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur V  Silvestri Jr  et al → SOUTH WINDSOR PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur V  Silvestri Jr  et al → East Hartford Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Enet Y  Silvestri  et al → East Hartford Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history