# Relationship history for MSHA mine 3401656

Current hierarchy: **Walker Jerry → J & W Construction → J & W Pit**

- 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:** Vanoss Sand & Trucking → J & W Pit; 1988-08-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Zientek Mike → J & W Pit; 1988-08-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Zientek Mike → Vanoss Sand & Trucking; 1988-08-01 to 1989-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Sand → J & W Pit; 1989-10-02 to 1991-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Harrison Tim → J & W Pit; 1989-10-02 to 1991-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Harrison Tim → Harrison Sand; 1989-10-02 to 1991-01-21; source msha-controller-operator-history
- **operator_operates_mine:** J & W Construction → J & W Pit; 1991-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walker Jerry → J & W Pit; 1991-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker Jerry → J & W Construction; 1991-01-22 to current/open; source msha-controller-operator-history