# Relationship history for MSHA mine 4801482

Current hierarchy: **Summit Materials LLC → Lewis and Lewis → Lewis & Lewis, Portable 01**

- 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:** Harold  Elam → Lewis & Lewis, Portable 01; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Lewis & Lewis Inc → Lewis & Lewis, Portable 01; 1988-04-01 to 2016-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Arnold N  Lewis → Lewis & Lewis, Portable 01; 1988-04-01 to 2015-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Arnold N  Lewis → Lewis & Lewis Inc; 1988-04-01 to 2015-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Lewis & Lewis, Portable 01; 2011-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Lewis & Lewis, Portable 01; 2015-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Lewis & Lewis Inc; 2015-06-01 to 2016-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Lewis and Lewis → Lewis & Lewis, Portable 01; 2016-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Lewis and Lewis; 2016-12-02 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Lewis and Lewis; 2016-12-02 to current/open; source msha-controller-operator-history