# Relationship history for MSHA mine 4608869

Current hierarchy: **John H  Wellford → Development Services Inc → Quincy Manufactured Home Park**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Development Services Inc → Quincy Manufactured Home Park; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John H  Wellford → Quincy Manufactured Home Park; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John H  Wellford → Development Services Inc; 2000-12-01 to current/open; source msha-controller-operator-history