# Relationship history for MSHA mine 3503877

Current hierarchy: **John  McAmis → J.E. McAmis Inc → Mine 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** John  McAmis → Mine 2; 2018-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J.E. McAmis Inc → Mine 2; 2018-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  McAmis → J.E. McAmis Inc; 2018-12-13 to current/open; source msha-controller-operator-history