Note from Drew's pic the Baker is a back action sidelock, but with a plate shape resembling a bar action, as is the L C Smith.
The Lefever Arms Co guns have a similar configuration to a Bar-ation sidelock, just the hammers are attached to the frame rather than sideplate. The mainspring rides in a channel in the bar but is totally "Unattached". Early models had the sears & their spring attaced to the sideplate, but later ones also attach these parts to frame. Technically they are thus boxlocks, but show no resemblance to the "Ordinary" Anson Deely action.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra