# Relationship history for MSHA mine 3503898

Current hierarchy: **John  McAmis → J. E. McAmis, Inc. → Mine #4**

- 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:** John  McAmis → Mine #4; 2018-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J. E. McAmis, Inc. → Mine #4; 2020-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  McAmis → J. E. McAmis, Inc.; 2020-01-31 to current/open; source msha-controller-operator-history