# Relationship history for MSHA mine 1512426

Current hierarchy: **Stigler Dave & Ray Emmons → E S P Enterprises Inc → No 1 Processing 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:** E S P Enterprises Inc → No 1 Processing Plant; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stigler Dave & Ray Emmons Et Al → No 1 Processing Plant; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stigler Dave & Ray Emmons Et Al → E S P Enterprises Inc; 1980-07-01 to current/open; source msha-controller-operator-history