# Relationship history for MSHA mine 2602461

Current hierarchy: **Wayne D  Jacks → Rock Trans, Inc. → Screening 1**

- 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:** Wayne D  Jacks → Screening 1; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Paving & Grading Inc → Screening 1; 2001-07-01 to 2001-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Wayne D  Jacks → Southwest Paving & Grading Inc; 2001-07-01 to 2001-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Rock Trans, Inc. → Screening 1; 2001-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne D  Jacks → Screening 1; 2001-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne D  Jacks → Rock Trans, Inc.; 2001-10-25 to current/open; source msha-controller-operator-history