Talvez deva tentar algumas variações de ortografia:
nay clamp » dnan clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa), a clamp (Expandir a Pesquisa)
gas coll » gas cell (Expandir a Pesquisa), gas coal (Expandir a Pesquisa), gas cells (Expandir a Pesquisa)
coll ngo » coll n (Expandir a Pesquisa), coll nrf (Expandir a Pesquisa), coll o (Expandir a Pesquisa)
coil now » coil nmr (Expandir a Pesquisa), coil nhl (Expandir a Pesquisa)
call now » call how (Expandir a Pesquisa), cell now (Expandir a Pesquisa), call note (Expandir a Pesquisa)
nat gas » net gas (Expandir a Pesquisa), fast gas (Expandir a Pesquisa), east gas (Expandir a Pesquisa)
clamp j » clamp _ (Expandir a Pesquisa)
j none » j noone (Expandir a Pesquisa), _ none (Expandir a Pesquisa), a none (Expandir a Pesquisa)
c nat » c nast (Expandir a Pesquisa), c nate (Expandir a Pesquisa), c nath (Expandir a Pesquisa)
j nay » j nagy (Expandir a Pesquisa), _ nay (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( c nat gas coll ngo ) or ((( j nay clamp j none ) or ( j _ con ((coil now) or (call now)) ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( c nat gas coll ngo ) OR ((( j nay clamp j none ) OR ( j _ con ((coil now) OR (call now)) )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( c nat gas coll ngo ) or ((( j nay clamp j none ) or ( j _ con ((coil now) or (call now)) ))))*.