# Relationship history for MSHA mine 2601692

Current hierarchy: **W M  Kerr; Raymond  Denison → D & K Exploration → Sidewinder**

- 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:** D & K Exploration → Sidewinder; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Denison et al → Sidewinder; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Denison et al → D & K Exploration; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W M  Kerr et al → D & K Exploration; 1980-11-01 to current/open; source msha-controller-operator-history