# Relationship history for MSHA mine 4002215

Current hierarchy: **Johnson Larry & Michael L → Johnson Brothers Coal Company → Mine #2**

- 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:** Welden Mining Company → Mine #2; 1977-04-01 to 1979-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Welden Alec C → Mine #2; 1977-04-01 to 1979-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Welden Alec C → Welden Mining Company; 1977-04-01 to 1979-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Wayne → Mine #2; 1978-04-05 to 1982-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Pilot Rock Mining Corp → Mine #2; 1979-05-10 to 1982-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Wayne → Pilot Rock Mining Corp; 1979-05-10 to 1982-03-31; source msha-controller-operator-history
- **operator_operates_mine:** C N H Mining Inc → Mine #2; 1982-04-01 to 1988-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Welden Alec C → Mine #2; 1982-04-01 to 1988-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Welden Alec C → C N H Mining Inc; 1982-04-01 to 1988-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Brothers Coal Company → Mine #2; 1988-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Larry & Michael L Et Al → Mine #2; 1988-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Larry & Michael L Et Al → Johnson Brothers Coal Company; 1988-05-14 to current/open; source msha-controller-operator-history