# Relationship history for MSHA mine 0401049

Current hierarchy: **Elizabeth  Anderson → United States Pumice Company → U S Pumice Mill**

- 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

- **operator_operates_mine:** United States Pumice Company → U S Pumice Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R Miles → U S Pumice Mill; 1950-01-01 to 2006-06-21; source msha-controller-operator-history
- **controller_controls_operator:** John R Miles → United States Pumice Company; 1950-01-01 to 2006-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Eric  Anderson → U S Pumice Mill; 2006-06-22 to 2015-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Anderson → United States Pumice Company; 2006-06-22 to 2015-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Elizabeth  Anderson → U S Pumice Mill; 2015-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elizabeth  Anderson → United States Pumice Company; 2015-10-15 to current/open; source msha-controller-operator-history