The drip pan Gem had 2 minor variants of Gem Automatic Reproducer.  Both 
were built into the carriage arm.  One has a wide connector flange and the 
other which has a machined modification to the carriage arm has a lesser 
diameter flange.  The more narrow came first and the wider flange allowed for a 
machine operation to be eliminated.  Both horn connector tube/flange plates 
were held in by 2 screws, one on top and one on the bottom.  The narrow 
connector flange changed to the wider flange about the same time the patent 
plate 
last patent date went from 1893 to 1898.
 
When the next 'branded case Gem' came out it had the stamped tin Gem 
special Automatic which bayoneted into place but was still held by 2 screws.
 
Regards to all,
 
Al
 
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