# Relationship history for MSHA mine 0405337

Current hierarchy: **De Silva Holding Company Inc; Richard B Gates → DeSilva Gates Construction, LLC → Curtner Quarry**

- 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:** E O  De Silva → Curtner Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rich  Gates → Curtner Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oliver De Silva Inc → Curtner Quarry; 1997-09-01 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_operator:** E O  De Silva → Oliver De Silva Inc; 1997-09-01 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** DQA → Curtner Quarry; 2004-01-01 to 2022-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Rich  Gates → DQA; 2004-01-01 to 2022-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Edwin O  DeSilva et al → Curtner Quarry; 2005-09-29 to 2022-05-04; source msha-controller-operator-history
- **operator_operates_mine:** DeSilva Gates Construction, LLC → Curtner Quarry; 2022-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edwin O  DeSilva et al → DeSilva Gates Construction, LLC; 2022-05-05 to 2022-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Richard B  Gates et al → DeSilva Gates Construction, LLC; 2022-05-05 to 2022-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Richard B Gates et al → Curtner Quarry; 2022-05-05 to 2025-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Richard B Gates et al → DeSilva Gates Construction, LLC; 2022-05-05 to 2025-04-10; source msha-controller-operator-history
- **controller_controls_operator:** De Silva Holding Company Inc et al → DeSilva Gates Construction, LLC; 2022-05-05 to 2025-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Oliver DeSilva Inc et al → Curtner Quarry; 2025-04-11 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Oliver DeSilva Inc et al → DeSilva Gates Construction, LLC; 2025-04-11 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_operator:** El Portal Real Estate Co et al → DeSilva Gates Construction, LLC; 2025-04-11 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Richard B Gates et al → Curtner Quarry; 2025-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard B Gates et al → DeSilva Gates Construction, LLC; 2025-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Silva Holding Company Inc et al → DeSilva Gates Construction, LLC; 2025-12-19 to current/open; source msha-controller-operator-history