# Relationship history for MSHA mine 2602728

Current hierarchy: **Raymond  Ames → Ames Construction Inc. → Ames Backfill Portable Crusher**

- 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

- **controller_controls_mine:** Richard  Ames → Ames Backfill Portable Crusher; 1991-05-01 to 2019-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Ames Construction Inc. → Ames Backfill Portable Crusher; 2013-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Ames → Ames Construction Inc.; 2013-01-03 to 2019-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Ames → Ames Backfill Portable Crusher; 2019-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Ames → Ames Construction Inc.; 2019-01-31 to current/open; source msha-controller-operator-history