# Relationship history for MSHA mine 1102924

Current hierarchy: **Fosco Fred → Bartlett Road Materials → Portable Plant #One**

- 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:** Bartlett Road Materials → Portable Plant #One; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fosco Fred → Portable Plant #One; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fosco Fred → Bartlett Road Materials; 1992-05-01 to current/open; source msha-controller-operator-history