# Relationship history for MSHA mine 3503786

Current hierarchy: **Matthew  Chavarria → Chavarria Construction Inc. → Portable 2**

- 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:** Matthew  Chavarria → Portable 2; 2001-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chavarria Construction Inc. → Portable 2; 2012-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Chavarria → Chavarria Construction Inc.; 2012-10-10 to current/open; source msha-controller-operator-history