# Relationship history for MSHA mine 4104547

Current hierarchy: **Julie  (Mumme) Smith; William  Mumme → Sand Mill Inc. → Portable Plant #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:** Julie  (Mumme) Smith et al → Portable Plant #2; 1996-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sand Mill Inc. → Portable Plant #2; 2005-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julie  (Mumme) Smith et al → Sand Mill Inc.; 2005-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Mumme et al → Sand Mill Inc.; 2005-09-07 to current/open; source msha-controller-operator-history