# Relationship history for MSHA mine 0900028

Current hierarchy: **James A  Adams → Greene County Quarries, Inc. → Royalty-Berkeley Quarry**

- 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:** James A  Adams  et al → Royalty-Berkeley Quarry; 1991-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Childs & Childs Granite Company Inc → Royalty-Berkeley Quarry; 1992-01-28 to 2001-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Kurt M  Swenson → Royalty-Berkeley Quarry; 1992-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt M  Swenson → Childs & Childs Granite Company Inc; 1992-01-28 to 2001-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Greene County Quarries, Inc. → Royalty-Berkeley Quarry; 2001-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Adams  et al → Greene County Quarries, Inc.; 2001-10-22 to current/open; source msha-controller-operator-history