# Relationship history for MSHA mine 0600673

Current hierarchy: **Pieritalo  Bauchiero → Torrington Diesel Corp → RORRINGTON DIESEL**

- 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:** Torrington Diesel Corp → RORRINGTON DIESEL; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pieritalo  Bauchiero → RORRINGTON DIESEL; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pieritalo  Bauchiero → Torrington Diesel Corp; 1999-09-01 to current/open; source msha-controller-operator-history