IPA Braille is the modern standard Braille encoding of the International Phonetic Alphabet (IPA), as recognized by the International Council on English Braille. 

A braille version of the IPA was first created by Merrick and Potthoff in 1934, and published in London. It was used in France, Germany, and anglophone countries. However, it was not updated as the IPA evolved, and by 1989 had become obsolete. In 1990 it was officially reissued by BAUK, but in a corrupted form that made it largely unworkable. In 1997 BANA created a completely new system for the United States and Canada. However, it was incompatible with braille IPA elsewhere in the world and in addition proved to be cumbersome and often inadequate. In 2008 Robert Englebretson revised the Merrick and Potthoff notation and by 2011 this had been accepted by BANA. It is largely true to the original in consonants and vowels, though the diacritics were completely reworked, as necessitated by the major revisions in print IPA diacritics since 1934. The diacritics were also made more systematic, and follow rather than precede the base letters. However, it has no general procedure for marking tone, and not all diacritics can be written. 

IPA Braille does not use the conventions of English Braille. It is set off by slash or square brackets, which indicate that the intervening material is IPA rather than national orthography. Thus brackets are required in braille even when not used in print.
Does IPA Braille use the conventions of English Braille?
what indicates that the material is IPA?
are those brackets required?
what year did IPA become obsolete?
what is IPA?
where was it put into use?
where else?
who created it?
where was it first published?
when?
who reissued it?
was that version successful?
who created a completely new system?
when?
was it compatible withe Braille from other places?
what countries was it for?
who revised the Merrick and Pothoff version?
what did he completely rework?
was it accepted by BANA?
can all diacritics be written?
No
IPA Braille does not use the conventions of English Braille
It is set off by slash or square brackets
It is set off by slash or square brackets, which indicate that the intervening material is IPA r
Yes
Thus brackets are required in braille even when not used in print.
1989
 IPA evolved, and by 1989 had become obsolete.
the modern standard Braille encoding of the International Phonetic Alphabet
IPA Braille is the modern standard Braille encoding of the International Phonetic Alphabet
France
It was used in France
Germany
It was used in France, Germany
Merrick and Potthoff
A braille version of the IPA was first created by Merrick and Potthoff 
London
PA was first created by Merrick and Potthoff in 1934, and published in London
1934
 in 1934, and published in London.
BAUK
 it was officially reissued by BAUK
No
it was officially reissued by BAUK, but in a corrupted form that made it largely unworkable
BANA
 BANA created a completely new system
In 1997
 In 1997 BANA created a completely new system
No
In 1997 BANA created a completely new system for the United States and Canada. However, it was incompatible with braille IPA elsewhere in the world
the United States and Canada
In 1997 BANA created a completely new system for the United States and Canada
Robert Englebretson
Robert Englebretson revised the Merrick and Potthoff 
the diacritics
 It is largely true to the original in consonants and vowels, though the diacritics were completely reworked,
Yes
 Robert Englebretson revised the Merrick and Potthoff notation and by 2011 this had been accepted by BANA. 
No
 not all diacritics can be written. 