# Relationship history for MSHA mine 4103505

Current hierarchy: **Vineyard Barbara → Manvel Sand Pit → Manvel 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Southfield Materials → Manvel Sand Pit; 1988-01-01 to 1989-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Aycock Eddie Et Al → Manvel Sand Pit; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aycock Eddie Et Al → Southfield Materials; 1988-01-01 to 1989-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Manvel Sand Pit → Manvel Sand Pit; 1989-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vineyard Barbara → Manvel Sand Pit; 1989-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vineyard Barbara → Manvel Sand Pit; 1989-06-15 to current/open; source msha-controller-operator-history