# Relationship history for MSHA mine 0404991

Current hierarchy: **Barry  Yampol; David  Yampol → Jessica Mining Company Llc → UPPER DEMARIA MINE**

- 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:** De Maria Mines → UPPER DEMARIA MINE; 1988-12-01 to 1999-06-13; source msha-controller-operator-history
- **controller_controls_mine:** John  De Maria → UPPER DEMARIA MINE; 1988-12-01 to 1999-06-13; source msha-controller-operator-history
- **controller_controls_operator:** John  De Maria → De Maria Mines; 1988-12-01 to 1999-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Jessica Mining Company Llc → UPPER DEMARIA MINE; 1999-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Yampol et al → UPPER DEMARIA MINE; 1999-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Yampol et al → Jessica Mining Company Llc; 1999-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry  Yampol et al → Jessica Mining Company Llc; 1999-06-14 to current/open; source msha-controller-operator-history