# Relationship history for MSHA mine 3401528

Current hierarchy: **Jason  Flusche; John  Flusche → F & F Materials Inc → F&F SAND**

- 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:** Choska Sand → F&F SAND; 1985-09-01 to 1997-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Choska Sand → F&F SAND; 1985-09-01 to 1997-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Choska Sand → Choska Sand; 1985-09-01 to 1997-04-03; source msha-controller-operator-history
- **operator_operates_mine:** F & F Materials Inc → F&F SAND; 1997-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Flusche  et al → F&F SAND; 1997-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Flusche  et al → F & F Materials Inc; 1997-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Flusche  et al → F & F Materials Inc; 1997-04-04 to current/open; source msha-controller-operator-history