Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control an "Ancient Gear", you can Special Summon this card (from your hand) in Attack Position.
--古代の歯車
--Ancient Gear
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE+EFFECT_FLAG_SPSUM_PARAM)
	e1:SetTargetRange(POS_FACEUP_ATTACK,0)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
end
s.listed_names={id}
function s.filter(c)
	return c:IsFaceup() and c:IsCode(id)
end
function s.spcon(e,c)
	if c==nil then return true end
	return Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.filter,c:GetControler(),LOCATION_ONFIELD,0,1,nil)
end