# Relationship history for MSHA mine 1519658

Current hierarchy: **Leonard  Hendrickson → Hendrickson Equipment, Inc. → A23**

- 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:** Leonard  Hendrickson → A23; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Hendrickson et al → A23; 2004-12-30 to 2010-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Hendrickson → A23; 2010-04-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hendrickson Drilling LLC → A23; 2012-04-03 to 2019-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Hendrickson et al → Hendrickson Drilling LLC; 2012-04-03 to 2010-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Hendrickson et al → Hendrickson Drilling LLC; 2012-04-03 to 2010-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Hendrickson → Hendrickson Drilling LLC; 2012-04-03 to 2019-10-21; source msha-controller-operator-history
- **controller_controls_mine:** William K  Abraham → A23; 2019-10-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hendrickson Equipment Inc → A23; 2019-10-22 to 2020-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Hendrickson → Hendrickson Equipment Inc; 2019-10-22 to 2020-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Virgie Clean Mining LLC → A23; 2020-07-17 to 2024-03-10; source msha-controller-operator-history
- **controller_controls_operator:** William K  Abraham → Virgie Clean Mining LLC; 2020-07-17 to 2024-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Hendrickson Equipment, Inc. → A23; 2024-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Hendrickson → Hendrickson Equipment, Inc.; 2024-03-11 to current/open; source msha-controller-operator-history