# Relationship history for MSHA mine 3200587

Current hierarchy: **John  Melgaard; Kyle  True → Prism Logistics, LLC → Metso Screening Plant**

- 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:** Melgaard Sand & Gravel → Metso Screening Plant; 1950-01-01 to 2013-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Melgaard Sand & Gravel → Metso Screening Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melgaard Sand & Gravel → Melgaard Sand & Gravel; 1950-01-01 to 2013-02-04; source msha-controller-operator-history
- **controller_controls_mine:** John E  Melgaard Sr. → Metso Screening Plant; 2001-09-01 to 2018-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Melgaard Construction → Metso Screening Plant; 2013-02-05 to 2023-01-31; source msha-controller-operator-history
- **controller_controls_operator:** John E  Melgaard Sr. → Melgaard Construction; 2013-02-05 to 2018-09-30; source msha-controller-operator-history
- **controller_controls_mine:** John E  Melgaard Jr → Metso Screening Plant; 2018-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Melgaard Jr → Melgaard Construction; 2018-10-01 to 2023-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Prism Logistics, LLC → Metso Screening Plant; 2023-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kyle  True et al → Metso Screening Plant; 2023-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle  True et al → Prism Logistics, LLC; 2023-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Melgaard et al → Prism Logistics, LLC; 2023-02-01 to current/open; source msha-controller-operator-history