# Relationship history for MSHA mine 5001301

Current hierarchy: **Kim  Ferguson → Ajax Mining Alaska Inc → Walker Fork**

- 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:** Fred & Dave Heflinger → Walker Fork; 1979-01-01 to 2016-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Fred & Dave Heflinger → Walker Fork; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred & Dave Heflinger → Fred & Dave Heflinger; 1979-01-01 to 2016-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Ajax Mining Alaska Inc → Walker Fork; 2016-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kim  Ferguson → Walker Fork; 2016-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kim  Ferguson → Ajax Mining Alaska Inc; 2016-04-29 to current/open; source msha-controller-operator-history