# Relationship history for MSHA mine 2103209

Current hierarchy: **Bradley  Fitzgerald → Fitzgerald Construction Company → Cedarapids Screen 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

- **controller_controls_mine:** Ronald E  Fitzgerald → Cedarapids Screen Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fitzgerald Construction Co → Cedarapids Screen Plant; 1999-07-01 to 2007-03-28; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Fitzgerald → Fitzgerald Construction Co; 1999-07-01 to 2007-03-28; source msha-controller-operator-history
- **operator_operates_mine:** Fitzgerald Construction Company → Cedarapids Screen Plant; 2007-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradley  Fitzgerald → Cedarapids Screen Plant; 2007-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley  Fitzgerald → Fitzgerald Construction Company; 2007-03-29 to current/open; source msha-controller-operator-history