Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 10 Inventions on keyboard attachments-A TRIZ based analysis   Although the primary objective of the keyboard to input data into the
computer, the advanced keyboards keep various other things in mind, such as,
how to use the same keyboard for various other purposes, or how to use the same
keyboard efficiently by using various other attachments to the keyboard. This
objective led to various inventions on keyboard attachments, some of which are
illustrated below in this article.
  This article illustrates 10 inventions on various keyboard attachments from
US patent database. Each different attachment improves the usability of the
keyboard in some way or other. Some attachments illustrated are template
holders, paper holders, pointing device attachments, mouse pad attachments,
wrist rest attachments, storage device attachments, and multimedia attachments.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th