Thank You for Your time Hans, I do not like 0777 as well, but I was shooting in 
the dark. As stated, I tried 
## Brother MFC-1910W
ATTRS{idVendor}=="04f9", ATTRS{idProduct}=="035d", MODE="0666", 
GROUP="scanner", ENV{libsane_matched}="yes" (or 0660 0664 0777 modes)

which should be the equivalent of Your 
# Brother brscan3 devices
ATTRS{idVendor}=="04f9", ATTRS{idProduct}=="*", MODE="0664", GROUP="scanner", 
ENV{libsane_matched}="yes" 

no joy.

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https://bugs.launchpad.net/bugs/1728012

Title:
  Many 3rd party scanner drivers are broken by a sane change

Status in sane-backends package in Ubuntu:
  Confirmed

Bug description:
  Many scanners can no more be used since sane has changed something:
  The 3rd-party plug-in the vendor provides as .deb package will still
  install. But the scanner is no more recognized.

  Scanners that are affected are(besides others):
   - Epson Perfection V10
   - Epson Perfection V1000
   - Epson WorkForce GT-1500
   - Brother MFC-8510DN
   - Epson Perfection V33

  It is to note that the probability that the scanner manufacturers fix
  things others broke is below 100%.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libsane1 1.0.27-1~experimental2ubuntu2
  Uname: Linux 4.14.0-041400rc5-lowlatency x86_64
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  Date: Fri Oct 27 12:35:52 2017
  EcryptfsInUse: Yes
  SourcePackage: sane-backends
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1728012/+subscriptions

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