SQL Server 2008 :: Selecting Records Not Between 2 Dates

I’m trying to extract a list of records that don’t appear between 2 dates. I have 4 tables:

tblCustomers
tblMachines
tblServiceOrders
tblMachinesServiced

tblCustomers contains a CustomerID that is unique to each customer.

tblMachines contains a list of all machines with a MachineID that is unique to each machine. It also contains the CustomerID number.

tblServiceOrders contains a list of each time each customer was serviced. It contains the ServiceDate, CustomerID, and ServiceOrderNo. But it does not have any information on the machines.

tblMachinesServiced contains a list of each machine that was serviced for each service order. It contains the ServiceOrderNo and the MachineID number.

What I want is to be able to extract a list of machines that were not serviced between 2 dates. What I end up getting is a list of machines that were serviced outside of the date range I provide.

For instance, say machine A was serviced in 2013 and 2015 but not in 2014. And say machine B was serviced in all 3 years. When I try to extract my list of machines not serviced in 2014 I end up with a list that contains machine A-2013, A-2015, B-2013 & B-2015. But what I need is just machine A-2014, since that machine wasn’t serviced in 2014.

I’ve tried several different queries but here is an example:

SELECT tblMachines.MachineID,ServiceMachines.ServiceDate
FROM tblMachines
LEFT JOIN
(SELECT MachineID, ServiceDate FROM tblServiceOrders, tblMachinesServiced
WHERE tblServiceOrders.ServiceOrderNo=tblMachinesServiced.ServiceOrderNo
) ServicedMachines
ON tblMachines.MachineID=ServicedMachines.MachineID
WHERE YEAR(ServiceDate) != '2014'

I understand why it returns the records that it does, but I'm not sure how to get what I want, which is a list of machines not serviced in 2014.