# Relationship history for MSHA mine 3609937

Current hierarchy: **Martin A  Galasso Jr → Tri City Highway Products Incorporated → Onyon Quarry**

- 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:** Martin A  Galasso Jr et al → Onyon Quarry; 2003-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri City Highway Products Incorporated → Onyon Quarry; 2011-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin A  Galasso Jr et al → Tri City Highway Products Incorporated; 2011-07-07 to current/open; source msha-controller-operator-history