# Relationship history for MSHA mine 4406295

Current hierarchy: **Johnson Patrick R → Northern Coal Company → No 2 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:** Johnson Patrick R Et Al → No 2 Mine; 1986-03-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Paragon Smokeless Coal Corp → No 2 Mine; 1986-05-01 to 1986-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Yates David → No 2 Mine; 1986-05-01 to 1986-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Yates David → Paragon Smokeless Coal Corp; 1986-05-01 to 1986-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Northern Coal Company → No 2 Mine; 1986-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Patrick R Et Al → Northern Coal Company; 1986-07-30 to current/open; source msha-controller-operator-history