# Relationship history for MSHA mine 1513721

Current hierarchy: **Collins Jimmy & John Sexton → J & J Coal Company Inc → #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:** Collins Jimmy & John Sexton → #1; 1975-07-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & J Coal Company Inc → #1; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Jimmy & John Sexton → J & J Coal Company Inc; 1982-08-01 to current/open; source msha-controller-operator-history