# Relationship history for MSHA mine 2700429

Current hierarchy: **Robert P  Ambrose; Robert J  Ambrose → AMBROSE BROS., INC. → Astec Track 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

- **controller_controls_mine:** Robert P  Ambrose et al → Astec Track Screen; 1950-01-01 to 2015-12-31; source msha-controller-operator-history
- **operator_operates_mine:** AMBROSE BROS., INC. → Astec Track Screen; 2007-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Ambrose et al → AMBROSE BROS., INC.; 2007-11-27 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Edward A  Ambrose et al → AMBROSE BROS., INC.; 2007-11-27 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Ambrose et al → Astec Track Screen; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Ambrose et al → AMBROSE BROS., INC.; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Ambrose et al → AMBROSE BROS., INC.; 2016-01-01 to current/open; source msha-controller-operator-history