# Relationship history for MSHA mine 3304498

Current hierarchy: **Shelly & Sands Inc → S & S Aggregate → S & S Aggregate, Plant 4**

- 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:** Shelly & Sands Inc → S & S Aggregate, Plant 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** LINK TRUCKING CO. → S & S Aggregate, Plant 4; 2002-04-12 to 2006-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Kussmaul et al → S & S Aggregate, Plant 4; 2002-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Kussmaul et al → LINK TRUCKING CO.; 2002-04-12 to 2006-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Glen  Kussmaul et al → LINK TRUCKING CO.; 2002-04-12 to 2006-02-14; source msha-controller-operator-history
- **operator_operates_mine:** S & S Aggregate → S & S Aggregate, Plant 4; 2006-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelly & Sands Inc → S & S Aggregate; 2006-02-15 to current/open; source msha-controller-operator-history