# Relationship history for MSHA mine 1301917

Current hierarchy: **Irving  Jensen → Fort Dodge Asphalt Co → Croft Sand Pit**

- 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:** Fort Dodge Asphalt Co → Croft Sand Pit; 1979-01-01 to 2019-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Moore  et al → Croft Sand Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Moore  et al → Fort Dodge Asphalt Co; 1979-01-01 to 2019-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Fort Dodge Asphalt Co → Croft Sand Pit; 2019-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Irving  Jensen → Croft Sand Pit; 2019-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Irving  Jensen → Fort Dodge Asphalt Co; 2019-08-08 to current/open; source msha-controller-operator-history