# Relationship history for MSHA mine 0502577

Current hierarchy: **Reid Gordon P-Arnold W Spielman → Timberline Enterprises → Alma Placer**

- 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:** Timberline Enterprises → Alma Placer; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reid Gordon P-Arnold W Spielman Et Al → Alma Placer; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reid Gordon P-Arnold W Spielman Et Al → Timberline Enterprises; 1950-01-01 to current/open; source msha-controller-operator-history