# Relationship history for MSHA mine 0502501

Current hierarchy: **Federal Resources Corp → Camp Bird Colorado Inc → Bachelor-Syracuse**

- 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:** Federal Resources Corp → Bachelor-Syracuse; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Camp Bird Colorado Inc → Bachelor-Syracuse; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Federal Resources Corp → Camp Bird Colorado Inc; 1980-02-01 to current/open; source msha-controller-operator-history