# Relationship history for MSHA mine 0600749

Current hierarchy: **Monty O  Blakeman; James M  Blakeman → Blakeman Construction LLC → Portable Crusher**

- 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:** Blakeman Construction LLC → Portable Crusher; 2007-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James M  Blakeman  et al → Portable Crusher; 2007-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James M  Blakeman  et al → Blakeman Construction LLC; 2007-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monty O  Blakeman  et al → Blakeman Construction LLC; 2007-12-06 to current/open; source msha-controller-operator-history