# Relationship history for MSHA mine 3201023

Current hierarchy: **Travis  Klamm; John  Klamm → Black Diamond Construction Co → Crusher #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:** Black Diamond Construction Co → Crusher #1; 2013-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Travis  Klamm et al → Crusher #1; 2013-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Klamm et al → Black Diamond Construction Co; 2013-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Klamm et al → Black Diamond Construction Co; 2013-11-15 to current/open; source msha-controller-operator-history