# Relationship history for MSHA mine 3610240

Current hierarchy: **A Ross  Myers → Allan Myers Materials Inc → ALLAN MYERS PORTABLE**

- 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:** A Ross  Myers → ALLAN MYERS PORTABLE; 2007-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Allan Myers Inc → ALLAN MYERS PORTABLE; 2018-04-13 to 2020-08-05; source msha-controller-operator-history
- **controller_controls_mine:** A Ross  Myers → ALLAN MYERS PORTABLE; 2018-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Allan Myers Inc; 2018-04-13 to 2020-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Allan Myers Materials → ALLAN MYERS PORTABLE; 2020-08-06 to 2022-04-10; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Allan Myers Materials; 2020-08-06 to 2022-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Allan Myers Materials Inc → ALLAN MYERS PORTABLE; 2022-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** A Ross  Myers → ALLAN MYERS PORTABLE; 2022-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Allan Myers Materials Inc; 2022-04-11 to current/open; source msha-controller-operator-history