# Relationship history for MSHA mine 1002099

Current hierarchy: **John E  Melgaard Jr → Melgaard Construction Company Inc. → 2004 Cedar Rapids**

- 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:** John E  Melgaard Sr. → 2004 Cedar Rapids; 2001-09-01 to 2018-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Minnie Moore Resources, Inc. → 2004 Cedar Rapids; 2006-08-16 to 2019-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Carl B.  Johnston → 2004 Cedar Rapids; 2006-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl B.  Johnston → Minnie Moore Resources, Inc.; 2006-08-16 to 2019-06-25; source msha-controller-operator-history
- **controller_controls_mine:** John E  Melgaard Jr → 2004 Cedar Rapids; 2018-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Melgaard Construction Company Inc. → 2004 Cedar Rapids; 2019-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Melgaard Jr → Melgaard Construction Company Inc.; 2019-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Melgaard Sr. → Melgaard Construction Company Inc.; 2019-06-26 to 2018-09-30; source msha-controller-operator-history