# Relationship history for MSHA mine 4503810

Current hierarchy: **Joel  Schiefelbein; Tonya  Schiefelbein → North Fork Resources → Portable 1**

- 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:** North Fork Resources → Portable 1; 2020-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Schiefelbein et al → Portable 1; 2020-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Schiefelbein et al → North Fork Resources; 2020-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tonya  Schiefelbein et al → North Fork Resources; 2020-11-09 to current/open; source msha-controller-operator-history