# Relationship history for MSHA mine 0505070

Current hierarchy: **Randy  Bucklen; Michael A  Bucklen; Judy  May → Bucklen Equipment Co Inc → Screen Plant**

- 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:** Michael Allen  Bucklen → Screen Plant; 1985-05-01 to 2012-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Bucklen et al → Screen Plant; 2012-09-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bucklen Equipment Co Inc → Screen Plant; 2015-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Bucklen et al → Bucklen Equipment Co Inc; 2015-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Judy  May et al → Bucklen Equipment Co Inc; 2015-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Bucklen et al → Bucklen Equipment Co Inc; 2015-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Allen  Bucklen → Bucklen Equipment Co Inc; 2015-09-01 to 2012-09-17; source msha-controller-operator-history