# Relationship history for MSHA mine 3503298

Current hierarchy: **Matthew  Chavarria → Chavarria Construction Inc. → Portable 3**

- 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:** Wendell  Lux et al → Portable 3; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Three Way Portable Crushing → Portable 3; 1987-11-01 to 2011-09-05; source msha-controller-operator-history
- **controller_controls_operator:** Wendell  Lux et al → Three Way Portable Crushing; 1987-11-01 to 2011-09-05; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Hanson et al → Three Way Portable Crushing; 1987-11-01 to 2011-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Chavarria → Portable 3; 2001-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Three Way Portable Crushing II, Inc. → Portable 3; 2011-09-06 to 2013-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Carl W  Greenlund → Portable 3; 2011-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl W  Greenlund → Three Way Portable Crushing II, Inc.; 2011-09-06 to 2013-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Chavarria Construction Inc. → Portable 3; 2013-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Chavarria → Chavarria Construction Inc.; 2013-05-07 to current/open; source msha-controller-operator-history