# Relationship history for MSHA mine 3200937

Current hierarchy: **Reed C  Kirby → Pro Safe Services INC → Pro Safe Pit #1**

- 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

- **operator_operates_mine:** Pro Safe Services INC → Pro Safe Pit #1; 2012-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reed C.  Kirby et al → Pro Safe Pit #1; 2012-01-24 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Reed C.  Kirby et al → Pro Safe Services INC; 2012-01-24 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Timothy R.  Holm et al → Pro Safe Services INC; 2012-01-24 to 2015-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Reed C  Kirby → Pro Safe Pit #1; 2015-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reed C  Kirby → Pro Safe Services INC; 2015-06-16 to current/open; source msha-controller-operator-history