# Relationship history for MSHA mine 4801637

Current hierarchy: **AVCO Holdings LLC → Avail Valley Construction-WY, LLC → Avail Valley Construction**

- 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:** Kel-Co Inc → Avail Valley Construction; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Call Gravel → Avail Valley Construction; 2003-07-14 to 2006-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Kel-Co Inc → Call Gravel; 2003-07-14 to 2006-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Call Gravel → Avail Valley Construction; 2006-10-01 to 2007-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Kel-Co Inc → Avail Valley Construction; 2006-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kel-Co Inc → Call Gravel; 2006-10-01 to 2007-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Kilroy LLC → Avail Valley Construction; 2007-04-23 to 2020-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Billie Jo  Kilroy → Avail Valley Construction; 2007-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billie Jo  Kilroy → Kilroy LLC; 2007-04-23 to 2020-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Avail Valley Construction-WY, LLC → Avail Valley Construction; 2020-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** AVCO Holdings LLC → Avail Valley Construction; 2020-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** AVCO Holdings LLC → Avail Valley Construction-WY, LLC; 2020-03-16 to current/open; source msha-controller-operator-history