# Relationship history for MSHA mine 2602426

Current hierarchy: **Don W  Tibbals → Jessup Aggregates → Jessup**

- 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:** Northern Nevada Stone Company Inc → Jessup; 2000-04-01 to 2001-02-28; source msha-controller-operator-history
- **controller_controls_mine:** John M  Torok → Jessup; 2000-04-01 to 2001-02-28; source msha-controller-operator-history
- **controller_controls_operator:** John M  Torok → Northern Nevada Stone Company Inc; 2000-04-01 to 2001-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Jessup Aggregates → Jessup; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don W  Tibbals → Jessup; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don W  Tibbals → Jessup Aggregates; 2001-03-01 to current/open; source msha-controller-operator-history