# Relationship history for MSHA mine 3503374

Current hierarchy: **MDU Resources Group Inc → Rogue Aggregates Inc → FARMERS**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Farmers Sand & Gravel → FARMERS; 1992-07-01 to 1996-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Frank H  Wallace → FARMERS; 1992-07-01 to 1996-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Frank H  Wallace → Farmers Sand & Gravel; 1992-07-01 to 1996-06-20; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → FARMERS; 1993-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Farmers Rock Products Llc → FARMERS; 1996-06-21 to 1998-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Wallace  et al → FARMERS; 1996-06-21 to 1998-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Wallace  et al → Farmers Rock Products Llc; 1996-06-21 to 1998-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → FARMERS; 1998-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Rogue Aggregates Inc; 1998-03-26 to current/open; source msha-controller-operator-history