Find MININT computers and retrieve their service tag / serial numbers.

# get list of MININT* computers
$Computers = Get-ADComputer -Filter "Name -like 'MININT*'"

# get serial numbers for each computer
ForEach ($x in $Computers) {
	$colItems = Get-WmiObject Win32_BIOS -Namespace “root\CIMV2" -computername $x.DNSHostName -ErrorAction SilentlyContinue

	if ($colItems -ne $null) {
		ForEach($objItem in $colItems) { 
			Write-Host $x.Name "=" $objItem.SerialNumber
		}
	}
}