# Relationship history for MSHA mine 1508330

Current hierarchy: **Parsons Jim → U S Mng & Exploration & Natural Resources Co Inc → No 11 Surface**

- 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:** U S Mining & Exploration Of Natural Resources → No 11 Surface; 1975-05-01 to 1980-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Zicka Mike → No 11 Surface; 1975-05-01 to 1980-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Zicka Mike → U S Mining & Exploration Of Natural Resources; 1975-05-01 to 1980-09-28; source msha-controller-operator-history
- **operator_operates_mine:** U S Mng & Exploration & Natural Resources Co Inc → No 11 Surface; 1980-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Parsons Jim → No 11 Surface; 1980-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Jim → U S Mng & Exploration & Natural Resources Co Inc; 1980-09-29 to current/open; source msha-controller-operator-history