# Relationship history for MSHA mine 1601438

Current hierarchy: **Thomas E  Johnson → Johnson Aggregate Materials, Inc. → Swindle Lease**

- 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:** Thomas E  Johnson → Swindle Lease; 2005-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Rock Company, Inc. → Swindle Lease; 2006-07-26 to 2012-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Johnson → Johnson Rock Company, Inc.; 2006-07-26 to 2012-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Aggregate Materials, Inc. → Swindle Lease; 2012-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Johnson → Swindle Lease; 2012-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Johnson → Johnson Aggregate Materials, Inc.; 2012-07-09 to current/open; source msha-controller-operator-history