# Relationship history for MSHA mine 3401205

Current hierarchy: **Randy  Duffield; Larry  Duffield → Souter Construction Company Inc → Duffield Quarry No 1**

- 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:** Randy  Duffield et al → Duffield Quarry No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Souter Construction Company Inc → Duffield Quarry No 1; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Duffield et al → Souter Construction Company Inc; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Duffield et al → Souter Construction Company Inc; 1979-01-01 to current/open; source msha-controller-operator-history