# Relationship history for MSHA mine 2103182

Current hierarchy: **Chad A  Anderson → Jeffers Dray Line Inc → PORTABLE #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

- **operator_operates_mine:** Jeffers Dray Line → PORTABLE #1; 1998-08-01 to 1999-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Mary C  Quade → PORTABLE #1; 1998-08-01 to 1999-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Mary C  Quade → Jeffers Dray Line; 1998-08-01 to 1999-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Jeffers Dray Line Inc → PORTABLE #1; 1999-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chad A  Anderson → PORTABLE #1; 1999-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad A  Anderson → Jeffers Dray Line Inc; 1999-08-26 to current/open; source msha-controller-operator-history