# Relationship history for MSHA mine 1517031

Current hierarchy: **David  Hogg → Kannan Mining Company Inc → Mine No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** David  Hogg et al → Mine No 2; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kannan Mining Company Inc → Mine No 2; 1990-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Hogg et al → Kannan Mining Company Inc; 1990-12-01 to current/open; source msha-controller-operator-history