[NLRS] TTL Clock Oscillator pinout ?

[Melvynkc0p--- via NLRS]

I have a CTSS 19357H square 64 MHz clock oscillator that I want to  make
into a weak signal source for 10 GHz, What is the pinout of the four  pins
relative to the one corner that has a tab compared to the three rounded  
ones ?
 
Should I be able to verify with an ohm meter in the x10 range to limit  
current ?
 
73, Mel KC0P/R