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Need help identifying part, possibly a resonator

I have parts that I need to identify. As you would see below, they all have a manufacturer marking of a large C, with a small o or c inside of it... 1.jpg came from a radio receiver with marking 2.00S or perhaps 2.003. At 2.jpg, which came from a transmitter have a marking 4.00Z. And, lastly 3.jpg also came from a transmitter, with a 4.00h.

Can you guys help me out?
 

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May not be much help, but muRata Ceralock ceramic resonators have the Large 'C' with a small 'm' inside of it as their logo. Might that be an 'm' ?
They DO look like resonators to me.
 
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