# Relationship history for MSHA mine 1700696

Current hierarchy: **William D  Mills; Joy  Mills → Mills Excavation, Inc. → Mills Excavation Inc.**

- 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

- **operator_operates_mine:** William D Mills Contractor → Mills Excavation Inc.; 2001-04-01 to 2010-07-27; source msha-controller-operator-history
- **controller_controls_mine:** William D  Mills et al → Mills Excavation Inc.; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William D  Mills et al → William D Mills Contractor; 2001-04-01 to 2010-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Joy  Mills et al → William D Mills Contractor; 2001-04-01 to 2010-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Mills Excavation, Inc. → Mills Excavation Inc.; 2010-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joy  Mills et al → Mills Excavation Inc.; 2010-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joy  Mills et al → Mills Excavation, Inc.; 2010-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William D  Mills et al → Mills Excavation, Inc.; 2010-07-28 to current/open; source msha-controller-operator-history