# Relationship history for MSHA mine 3901579

Current hierarchy: **Jeffrey L  Cullum → Mineral Technology Corporation → Pringle 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:** Jeffrey L  Cullum → Pringle Plant; 1987-01-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Technology Corporation → Pringle Plant; 2011-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey L  Cullum → Mineral Technology Corporation; 2011-09-22 to current/open; source msha-controller-operator-history