# Relationship history for MSHA mine 1400516

Current hierarchy: **David G Hoskinson; Daniel C Hoskinson → Mt Hope Sand Company Inc → Mt Hope Sand Company Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mt Hope Sand Company → Mt Hope Sand Company Inc; 1950-01-01 to 1989-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Donald W Hoskinson → Mt Hope Sand Company Inc; 1950-01-01 to 1989-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Donald W Hoskinson → Mt Hope Sand Company; 1950-01-01 to 1989-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Mt Hope Sand Company Inc → Mt Hope Sand Company Inc; 1989-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C Hoskinson et al → Mt Hope Sand Company Inc; 1989-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C Hoskinson et al → Mt Hope Sand Company Inc; 1989-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David G Hoskinson et al → Mt Hope Sand Company Inc; 1989-04-18 to current/open; source msha-controller-operator-history