# Relationship history for MSHA mine 3901581

Current hierarchy: **Mary  Weinheimer; Nancy  Ronning; Mark  Morris; Julie  Morris-Holter; Jo → Morris, Inc. → S.P. No. 2**

- 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:** Milton  Morris et al → S.P. No. 2; 1990-09-01 to 2021-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Morris, Inc. → S.P. No. 2; 2011-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milton  Morris et al → Morris, Inc.; 2011-10-19 to 2021-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Morris et al → S.P. No. 2; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Morris et al → Morris, Inc.; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Morris et al → Morris, Inc.; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary  Weinheimer et al → Morris, Inc.; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julie  Morris-Holter et al → Morris, Inc.; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  Ronning et al → Morris, Inc.; 2021-03-25 to current/open; source msha-controller-operator-history