# Relationship history for MSHA mine 0404296

Current hierarchy: **Nickerson C M → San Leandro Color Associates → Arkansas Flat**

- 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:** San Leandro Color Associates → Arkansas Flat; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nickerson C M → Arkansas Flat; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nickerson C M → San Leandro Color Associates; 1979-01-01 to current/open; source msha-controller-operator-history