# Relationship history for MSHA mine 3700247

Current hierarchy: **Roland J  Fiore → South County Sand & Gravel CO → Portable Crusher**

- 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:** Roland J  Fiore → Portable Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South County Sand & Gravel CO → Portable Crusher; 2025-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland J  Fiore → South County Sand & Gravel CO; 2025-04-15 to current/open; source msha-controller-operator-history