# Relationship history for MSHA mine 4404928

Current hierarchy: **Potter Hersel E → Yogi Mining Company Inc → No 1 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

- **controller_controls_mine:** Ratliff Bob H-John W & C B → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Belibe Coal Company → No 1 Mine; 1978-01-01 to 1978-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Bob H-John W & C B → Belibe Coal Company; 1978-01-01 to 1978-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Patrick Petroleum Corp Of Michigan → No 1 Mine; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Patrick Coal Corp → No 1 Mine; 1978-06-14 to 1982-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Patrick Petroleum Corp Of Michigan → Patrick Coal Corp; 1978-06-14 to 1982-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Yogi Mining Company Inc → No 1 Mine; 1982-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potter Hersel E → No 1 Mine; 1982-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter Hersel E → Yogi Mining Company Inc; 1982-02-17 to current/open; source msha-controller-operator-history