# Relationship history for MSHA mine 1518719

Current hierarchy: **James  Davidson Jr → D & D Processing LLC → #1 Surface**

- 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:** D & D Processing LLC → #1 Surface; 2004-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Davidson Jr  et al → #1 Surface; 2004-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Davidson Jr  et al → D & D Processing LLC; 2004-02-18 to current/open; source msha-controller-operator-history