# Relationship history for MSHA mine 1700555

Current hierarchy: **Stanley H  Ames; Timothy  Ames → Ames Mobile Home Sales → PORTABLE SCREEN**

- 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:** Ames Mobile Home Sales → PORTABLE SCREEN; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley H  Ames  et al → PORTABLE SCREEN; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley H  Ames  et al → Ames Mobile Home Sales; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Ames  et al → Ames Mobile Home Sales; 1981-06-01 to current/open; source msha-controller-operator-history