# Relationship history for MSHA mine 1700405

Current hierarchy: **Elementia Materiales → Dragon Products Company → Naples 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:** Burnham Brothers Inc → Naples Plant; 1950-01-01 to 1987-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Burnham Leland S → Naples Plant; 1950-01-01 to 1987-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Burnham Leland S → Burnham Brothers Inc; 1950-01-01 to 1987-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Burnham Brothers Inc → Naples Plant; 1987-08-21 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Kirsch Gregory R → Naples Plant; 1987-08-21 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Kirsch Gregory R → Burnham Brothers Inc; 1987-08-21 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_mine:** C D N - USA → Naples Plant; 1988-10-01 to 2007-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Dragon Products Company → Naples Plant; 1989-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C D N - USA → Dragon Products Company; 1989-10-02 to 2007-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Portland Valderrivas S A → Naples Plant; 2007-02-27 to 2016-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Portland Valderrivas S A → Dragon Products Company; 2007-02-27 to 2016-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Elementia Materiales → Naples Plant; 2016-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elementia Materiales → Dragon Products Company; 2016-10-26 to current/open; source msha-controller-operator-history