Deletion of Reciprocating electric motor

Comment: per .  See ''https://books.google.co.uk/books?hl=en&lr=&id=VG6r7IYCCwwC&oi=fnd&pg=PA473 Historical development and theoretical principles of compressors driven by oscillating electric motor'' for more
Stance: keep
Cited policy: Wikipedia:Disambiguation (WP:CONCEPTDAB)