1898 Mystery Cancels: The Dollar Commerce Values, Part 1

Need some help identifying the companies or individuals that placed the cancels on the stamps below.  We have some partial information to work with, but in some cases there may be no substitute for an on-document example.  There will be more posts like this one in the coming months.

KEECB or KEECE ?

Dave Thompson scan

J. B. & J. M. C.

OCT  19  1898

NEW YORK.

Langlois scan

NRY  T. CHA

Dave Thompson scan

P. J. G. & CO.

NOV

21

1898

N. Y.

Langlois scan

H. H. & CO.

OCT

25

1899

Dave Thompson scan

J.

Dave Thompson scan

C. E. G & Co.

FEB  XX  1902

Dave Thompson scan