# Relationship history for MSHA mine 1700975

Current hierarchy: **Douglas L  Ames; Silas C  Ames Jr → Ames Construction Inc. → Milo 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:** Ames Construction Inc. → Milo Pit; 2015-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas L  Ames et al → Milo Pit; 2015-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas L  Ames et al → Ames Construction Inc.; 2015-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Silas C  Ames Jr et al → Ames Construction Inc.; 2015-11-03 to current/open; source msha-controller-operator-history