# Relationship history for MSHA mine 0405549

Current hierarchy: **Mike J  LaPaglia → North County Sand & Gravel Inc → Fab-Tech 49**

- 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:** Mike J  LaPaglia → Fab-Tech 49; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North County Sand & Gravel Inc → Fab-Tech 49; 2003-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike J  LaPaglia → North County Sand & Gravel Inc; 2003-01-29 to current/open; source msha-controller-operator-history