# Relationship history for MSHA mine 4201451

Current hierarchy: **Johnson John M → Johnson Mining Company → Dime 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:** Watterson Jack T → Dime Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Watterson Mining → Dime Mine; 1978-03-09 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Watterson Jack T → Watterson Mining; 1978-03-09 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Johnson John M → Dime Mine; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Mining Company → Dime Mine; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson John M → Johnson Mining Company; 1979-02-01 to current/open; source msha-controller-operator-history