# Relationship history for MSHA mine 1302460

Current hierarchy: **James  Frank; Monica  Becker; Patrick  Nepereny → Stratford Gravel, Inc. → Portable Plant #3**

- 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:** Charles P  Becker → Portable Plant #3; 2011-03-15 to 2016-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Monica  Becker et al → Portable Plant #3; 2016-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stratford Gravel, Inc. → Portable Plant #3; 2016-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monica  Becker et al → Stratford Gravel, Inc.; 2016-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Frank et al → Stratford Gravel, Inc.; 2016-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick  Nepereny et al → Stratford Gravel, Inc.; 2016-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles P  Becker → Stratford Gravel, Inc.; 2016-09-26 to 2016-02-04; source msha-controller-operator-history