# Relationship history for MSHA mine 4300771

Current hierarchy: **James A Harrison; Janet  Harrison → HARRISON SAND INC. → PORTABLE CRUSHERS**

- 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:** Harrison Sand Inc et al → PORTABLE CRUSHERS; 1999-07-01 to 2014-04-29; source msha-controller-operator-history
- **controller_controls_mine:** James A Harrison et al → PORTABLE CRUSHERS; 2014-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Sand Inc. → PORTABLE CRUSHERS; 2015-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A Harrison et al → Harrison Sand Inc.; 2015-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janet  Harrison et al → Harrison Sand Inc.; 2015-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harrison Sand Inc et al → Harrison Sand Inc.; 2015-10-13 to 2014-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Wright's Excavating Inc et al → Harrison Sand Inc.; 2015-10-13 to 2014-04-29; source msha-controller-operator-history