# Relationship history for MSHA mine 3301076

Current hierarchy: **Johnson Ray & Lynn → Johnson Mining Company → Johnson 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:** Stewart William → Johnson Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zuspan Edgar L → Johnson Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P-4 Coal Corp → Johnson Mine; 1950-01-01 to 1971-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Derenge L D → Johnson Mine; 1950-01-01 to 1971-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Derenge L D → P-4 Coal Corp; 1950-01-01 to 1971-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Raven Coal Sales Inc → Johnson Mine; 1971-08-01 to 1973-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Zuspan Edgar L → Raven Coal Sales Inc; 1971-08-01 to 1973-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Stewart & Zinn Inc → Johnson Mine; 1973-10-01 to 1977-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Stewart William → Stewart & Zinn Inc; 1973-10-01 to 1977-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Mining Company → Johnson Mine; 1977-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ray & Lynn → Johnson Mine; 1977-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ray & Lynn → Johnson Mining Company; 1977-03-31 to current/open; source msha-controller-operator-history