# Relationship history for MSHA mine 0405475

Current hierarchy: **Dave  Beck → Quality Materials → Quality Materials (Rancho 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:** Dave  Beck → Quality Materials (Rancho Plant); 1997-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C D G Materials Inc → Quality Materials (Rancho Plant); 2001-03-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Beck → C D G Materials Inc; 2001-03-01 to 2003-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Quality Materials → Quality Materials (Rancho Plant); 2003-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Beck Et Al → Quality Materials (Rancho Plant); 2003-04-01 to 2008-12-28; source msha-controller-operator-history
- **controller_controls_operator:** David  Beck Et Al → Quality Materials; 2003-04-01 to 2008-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Pat  Davidson Et Al → Quality Materials; 2003-04-01 to 2008-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Beck → Quality Materials (Rancho Plant); 2008-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Beck → Quality Materials; 2008-12-29 to current/open; source msha-controller-operator-history