# Relationship history for MSHA mine 1101212

Current hierarchy: **Jack  Pease; Daniel  Plote → MARENGO MATERIALS LLC → MARENGO MATERIALS**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Road Materials Corp → MARENGO MATERIALS; 1950-01-01 to 1994-07-18; source msha-controller-operator-history
- **controller_controls_mine:** E M Melahn Construction Company Inc → MARENGO MATERIALS; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E M Melahn Construction Company Inc → Road Materials Corp; 1950-01-01 to 1994-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Prairie Group → MARENGO MATERIALS; 1984-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Prairie Material Sales, Inc.-Aggregate Division → MARENGO MATERIALS; 1994-07-19 to 2008-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Prairie Group → Prairie Material Sales, Inc.-Aggregate Division; 1994-07-19 to 2008-02-01; source msha-controller-operator-history
- **operator_operates_mine:** VCNA Prairie LLC → MARENGO MATERIALS; 2008-02-02 to 2017-04-05; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → MARENGO MATERIALS; 2008-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → VCNA Prairie LLC; 2008-02-02 to 2017-04-05; source msha-controller-operator-history
- **operator_operates_mine:** MARENGO MATERIALS LLC → MARENGO MATERIALS; 2017-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel  Plote et al → MARENGO MATERIALS; 2017-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel  Plote et al → MARENGO MATERIALS LLC; 2017-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Pease et al → MARENGO MATERIALS LLC; 2017-04-06 to current/open; source msha-controller-operator-history