# Relationship history for MSHA mine 0600655

Current hierarchy: **Joseph  Spezzano → Blue Rock Construction LLC → Blue Rock Portable**

- 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:** Joseph  Spezzano → Blue Rock Portable; 1995-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Joseph Spezzano Inc → Blue Rock Portable; 1997-04-01 to 2006-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezzano → Joseph Spezzano Inc; 1997-04-01 to 2006-06-11; source msha-controller-operator-history
- **operator_operates_mine:** MLS Construction LLC → Blue Rock Portable; 2006-06-12 to 2014-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Spezzano → Blue Rock Portable; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezzano → MLS Construction LLC; 2006-06-12 to 2014-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Blue Rock Construction LLC → Blue Rock Portable; 2014-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Spezzano → Blue Rock Portable; 2014-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezzano → Blue Rock Construction LLC; 2014-08-11 to current/open; source msha-controller-operator-history