# Relationship history for MSHA mine 0102019

Current hierarchy: **Young Gary M → Gary M Young Coal 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

- **operator_operates_mine:** Young Coal Company Inc → No 1 Mine; 1979-02-01 to 1982-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Young Carl → No 1 Mine; 1979-02-01 to 1982-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Young Carl → Young Coal Company Inc; 1979-02-01 to 1982-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Gary M Young Coal Company Inc → No 1 Mine; 1982-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Young Gary M → No 1 Mine; 1982-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Young Gary M → Gary M Young Coal Company Inc; 1982-03-16 to current/open; source msha-controller-operator-history